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Simplifying 81 = -3(-7 + -4r) 81 = (-7 * -3 + -4r * -3) 81 = (21 + 12r) Solving 81 = 21 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 81 + -12r = 21 + 12r + -12r Combine like terms: 12r + -12r = 0 81 + -12r = 21 + 0 81 + -12r = 21 Add '-81' to each side of the equation. 81 + -81 + -12r = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -12r = 21 + -81 -12r = 21 + -81 Combine like terms: 21 + -81 = -60 -12r = -60 Divide each side by '-12'. r = 5 Simplifying r = 5
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