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Simplifying 86 = -1 + -3(-1 + 4r) 86 = -1 + (-1 * -3 + 4r * -3) 86 = -1 + (3 + -12r) Combine like terms: -1 + 3 = 2 86 = 2 + -12r Solving 86 = 2 + -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. 86 + 12r = 2 + -12r + 12r Combine like terms: -12r + 12r = 0 86 + 12r = 2 + 0 86 + 12r = 2 Add '-86' to each side of the equation. 86 + -86 + 12r = 2 + -86 Combine like terms: 86 + -86 = 0 0 + 12r = 2 + -86 12r = 2 + -86 Combine like terms: 2 + -86 = -84 12r = -84 Divide each side by '12'. r = -7 Simplifying r = -7
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