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Simplifying -9(6 + -1r) = 18 (6 * -9 + -1r * -9) = 18 (-54 + 9r) = 18 Solving -54 + 9r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '54' to each side of the equation. -54 + 54 + 9r = 18 + 54 Combine like terms: -54 + 54 = 0 0 + 9r = 18 + 54 9r = 18 + 54 Combine like terms: 18 + 54 = 72 9r = 72 Divide each side by '9'. r = 8 Simplifying r = 8
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