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Simplifying -5(2 + -1r) = 20 (2 * -5 + -1r * -5) = 20 (-10 + 5r) = 20 Solving -10 + 5r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 5r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + 5r = 20 + 10 5r = 20 + 10 Combine like terms: 20 + 10 = 30 5r = 30 Divide each side by '5'. r = 6 Simplifying r = 6
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