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Simplifying 3(5 + -1r) = 18 (5 * 3 + -1r * 3) = 18 (15 + -3r) = 18 Solving 15 + -3r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -3r = 18 + -15 Combine like terms: 15 + -15 = 0 0 + -3r = 18 + -15 -3r = 18 + -15 Combine like terms: 18 + -15 = 3 -3r = 3 Divide each side by '-3'. r = -1 Simplifying r = -1
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