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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 = 33 -3r = 33 Divide each side by '-3'. r = -11 Simplifying r = -11
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