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Simplifying 87 = -3(3 + 4r) 87 = (3 * -3 + 4r * -3) 87 = (-9 + -12r) Solving 87 = -9 + -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. 87 + 12r = -9 + -12r + 12r Combine like terms: -12r + 12r = 0 87 + 12r = -9 + 0 87 + 12r = -9 Add '-87' to each side of the equation. 87 + -87 + 12r = -9 + -87 Combine like terms: 87 + -87 = 0 0 + 12r = -9 + -87 12r = -9 + -87 Combine like terms: -9 + -87 = -96 12r = -96 Divide each side by '12'. r = -8 Simplifying r = -8
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