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Simplifying -87 = -3(1 + -4r) -87 = (1 * -3 + -4r * -3) -87 = (-3 + 12r) Solving -87 = -3 + 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 = -3 + 12r + -12r Combine like terms: 12r + -12r = 0 -87 + -12r = -3 + 0 -87 + -12r = -3 Add '87' to each side of the equation. -87 + 87 + -12r = -3 + 87 Combine like terms: -87 + 87 = 0 0 + -12r = -3 + 87 -12r = -3 + 87 Combine like terms: -3 + 87 = 84 -12r = 84 Divide each side by '-12'. r = -7 Simplifying r = -7
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