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Simplifying -2(1 + r) = 12 (1 * -2 + r * -2) = 12 (-2 + -2r) = 12 Solving -2 + -2r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -2r = 12 + 2 Combine like terms: -2 + 2 = 0 0 + -2r = 12 + 2 -2r = 12 + 2 Combine like terms: 12 + 2 = 14 -2r = 14 Divide each side by '-2'. r = -7 Simplifying r = -7
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