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Simplifying -10(-1 + 12r) = 130 (-1 * -10 + 12r * -10) = 130 (10 + -120r) = 130 Solving 10 + -120r = 130 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 + -120r = 130 + -10 Combine like terms: 10 + -10 = 0 0 + -120r = 130 + -10 -120r = 130 + -10 Combine like terms: 130 + -10 = 120 -120r = 120 Divide each side by '-120'. r = -1 Simplifying r = -1
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