Answer:One solution was found : d = 19/3 = 6.333Step-by-step explanation:Step by step solution :Step 1 : 7 Simplify —— -3Equation at the end of step 1 : 7 (d + ——) - 4 = 0 -3 Step 2 :Rewriting the whole as an Equivalent Fraction : 2.1 Adding a fraction to a wholeRewrite the whole as a fraction using -3 as the denominator : d d • -3 d = — = —————— 1 -3 Equivalent fraction : The fraction thus generated looks different but has the same value as the wholeCommon denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominatorAdding fractions that have a common denominator : 2.2 Adding up the two equivalent fractionsAdd the two equivalent fractions which now have a common denominatorCombine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible: d • 3 + 7 • -1 3d - 7 —————————————— = —————— 3 3 Equation at the end of step 2 : (3d - 7) ———————— - 4 = 0 3 Step 3 :Rewriting the whole as an Equivalent Fraction : 3.1 Subtracting a whole from a fractionRewrite the whole as a fraction using 3 as the denominator : 4 4 • 3 4 = — = ————— 1 3 Adding fractions that have a common denominator : 3.2 Adding up the two equivalent fractions (3d-7) - (4 • 3) 3d - 19 ———————————————— = ——————— 3 3 Equation at the end of step 3 : 3d - 19 ——————— = 0 3 Step 4 :When a fraction equals zero : 4.1 When a fraction equals zero ...Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.Here's how: 3d-19 ————— • 3 = 0 • 3 3 Now, on the left hand side, the 3 cancels out the denominator, while, on the right hand side, zero times anything is still zero.The equation now takes the shape : 3d-19 = 0Solving a Single Variable Equation : 4.2 Solve : 3d-19 = 0 Add 19 to both sides of the equation : 3d = 19Divide both sides of the equation by 3: d = 19/3 = 6.333One solution was found : d = 19/3 = 6.333