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Simplifying -20 = 5(r + -5) Reorder the terms: -20 = 5(-5 + r) -20 = (-5 * 5 + r * 5) -20 = (-25 + 5r) Solving -20 = -25 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -20 + -5r = -25 + 5r + -5r Combine like terms: 5r + -5r = 0 -20 + -5r = -25 + 0 -20 + -5r = -25 Add '20' to each side of the equation. -20 + 20 + -5r = -25 + 20 Combine like terms: -20 + 20 = 0 0 + -5r = -25 + 20 -5r = -25 + 20 Combine like terms: -25 + 20 = -5 -5r = -5 Divide each side by '-5'. r = 1 Simplifying r = 1
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