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Simplifying -3(5 + -1r) = 12 (5 * -3 + -1r * -3) = 12 (-15 + 3r) = 12 Solving -15 + 3r = 12 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 = 12 + 15 Combine like terms: -15 + 15 = 0 0 + 3r = 12 + 15 3r = 12 + 15 Combine like terms: 12 + 15 = 27 3r = 27 Divide each side by '3'. r = 9 Simplifying r = 9
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