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Simplifying -3(5 + -4r) = 9 (5 * -3 + -4r * -3) = 9 (-15 + 12r) = 9 Solving -15 + 12r = 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 + 12r = 9 + 15 Combine like terms: -15 + 15 = 0 0 + 12r = 9 + 15 12r = 9 + 15 Combine like terms: 9 + 15 = 24 12r = 24 Divide each side by '12'. r = 2 Simplifying r = 2
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