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Simplifying -2(5 + -1r) = 8 (5 * -2 + -1r * -2) = 8 (-10 + 2r) = 8 Solving -10 + 2r = 8 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 + 2r = 8 + 10 Combine like terms: -10 + 10 = 0 0 + 2r = 8 + 10 2r = 8 + 10 Combine like terms: 8 + 10 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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