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Simplifying -9(2 + -1r) = 45 (2 * -9 + -1r * -9) = 45 (-18 + 9r) = 45 Solving -18 + 9r = 45 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 9r = 45 + 18 Combine like terms: -18 + 18 = 0 0 + 9r = 45 + 18 9r = 45 + 18 Combine like terms: 45 + 18 = 63 9r = 63 Divide each side by '9'. r = 7 Simplifying r = 7
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