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Simplifying -3(r + -15) = -12 Reorder the terms: -3(-15 + r) = -12 (-15 * -3 + r * -3) = -12 (45 + -3r) = -12 Solving 45 + -3r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + -3r = -12 + -45 Combine like terms: 45 + -45 = 0 0 + -3r = -12 + -45 -3r = -12 + -45 Combine like terms: -12 + -45 = -57 -3r = -57 Divide each side by '-3'. r = 19 Simplifying r = 19
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