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Simplifying -1(5 + 3r) = 2r + -20 (5 * -1 + 3r * -1) = 2r + -20 (-5 + -3r) = 2r + -20 Reorder the terms: -5 + -3r = -20 + 2r Solving -5 + -3r = -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. -5 + -3r + -2r = -20 + 2r + -2r Combine like terms: -3r + -2r = -5r -5 + -5r = -20 + 2r + -2r Combine like terms: 2r + -2r = 0 -5 + -5r = -20 + 0 -5 + -5r = -20 Add '5' to each side of the equation. -5 + 5 + -5r = -20 + 5 Combine like terms: -5 + 5 = 0 0 + -5r = -20 + 5 -5r = -20 + 5 Combine like terms: -20 + 5 = -15 -5r = -15 Divide each side by '-5'. r = 3 Simplifying r = 3
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