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Simplifying 3(3r + -5) = -87 Reorder the terms: 3(-5 + 3r) = -87 (-5 * 3 + 3r * 3) = -87 (-15 + 9r) = -87 Solving -15 + 9r = -87 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 + 9r = -87 + 15 Combine like terms: -15 + 15 = 0 0 + 9r = -87 + 15 9r = -87 + 15 Combine like terms: -87 + 15 = -72 9r = -72 Divide each side by '9'. r = -8 Simplifying r = -8
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