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Simplifying -5(r + -3) = -20 + 2r Reorder the terms: -5(-3 + r) = -20 + 2r (-3 * -5 + r * -5) = -20 + 2r (15 + -5r) = -20 + 2r Solving 15 + -5r = -20 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 15 + -5r + -2r = -20 + 2r + -2r Combine like terms: -5r + -2r = -7r 15 + -7r = -20 + 2r + -2r Combine like terms: 2r + -2r = 0 15 + -7r = -20 + 0 15 + -7r = -20 Add '-15' to each side of the equation. 15 + -15 + -7r = -20 + -15 Combine like terms: 15 + -15 = 0 0 + -7r = -20 + -15 -7r = -20 + -15 Combine like terms: -20 + -15 = -35 -7r = -35 Divide each side by '-7'. r = 5 Simplifying r = 5
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