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Simplifying -6(3 + -1r) = 18 (3 * -6 + -1r * -6) = 18 (-18 + 6r) = 18 Solving -18 + 6r = 18 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 + 6r = 18 + 18 Combine like terms: -18 + 18 = 0 0 + 6r = 18 + 18 6r = 18 + 18 Combine like terms: 18 + 18 = 36 6r = 36 Divide each side by '6'. r = 6 Simplifying r = 6
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