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Simplifying 3(5 + r) = -9 (5 * 3 + r * 3) = -9 (15 + 3r) = -9 Solving 15 + 3r = -9 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 = -9 + -15 Combine like terms: 15 + -15 = 0 0 + 3r = -9 + -15 3r = -9 + -15 Combine like terms: -9 + -15 = -24 3r = -24 Divide each side by '3'. r = -8 Simplifying r = -8
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