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Simplifying -6(5 + -1r) = 12 (5 * -6 + -1r * -6) = 12 (-30 + 6r) = 12 Solving -30 + 6r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 6r = 12 + 30 Combine like terms: -30 + 30 = 0 0 + 6r = 12 + 30 6r = 12 + 30 Combine like terms: 12 + 30 = 42 6r = 42 Divide each side by '6'. r = 7 Simplifying r = 7
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