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Simplifying -5(r + -3) = -45 Reorder the terms: -5(-3 + r) = -45 (-3 * -5 + r * -5) = -45 (15 + -5r) = -45 Solving 15 + -5r = -45 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 + -5r = -45 + -15 Combine like terms: 15 + -15 = 0 0 + -5r = -45 + -15 -5r = -45 + -15 Combine like terms: -45 + -15 = -60 -5r = -60 Divide each side by '-5'. r = 12 Simplifying r = 12
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