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Simplifying 3(5 + 4r) = -18r (5 * 3 + 4r * 3) = -18r (15 + 12r) = -18r Solving 15 + 12r = -18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18r' to each side of the equation. 15 + 12r + 18r = -18r + 18r Combine like terms: 12r + 18r = 30r 15 + 30r = -18r + 18r Combine like terms: -18r + 18r = 0 15 + 30r = 0 Add '-15' to each side of the equation. 15 + -15 + 30r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 30r = 0 + -15 30r = 0 + -15 Combine like terms: 0 + -15 = -15 30r = -15 Divide each side by '30'. r = -0.5 Simplifying r = -0.5
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