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Simplifying -2(-2r + 36) = -5r Reorder the terms: -2(36 + -2r) = -5r (36 * -2 + -2r * -2) = -5r (-72 + 4r) = -5r Solving -72 + 4r = -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. -72 + 4r + 5r = -5r + 5r Combine like terms: 4r + 5r = 9r -72 + 9r = -5r + 5r Combine like terms: -5r + 5r = 0 -72 + 9r = 0 Add '72' to each side of the equation. -72 + 72 + 9r = 0 + 72 Combine like terms: -72 + 72 = 0 0 + 9r = 0 + 72 9r = 0 + 72 Combine like terms: 0 + 72 = 72 9r = 72 Divide each side by '9'. r = 8 Simplifying r = 8
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