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Simplifying -2(1r + 7) = -39 Reorder the terms: -2(7 + 1r) = -39 (7 * -2 + 1r * -2) = -39 (-14 + -2r) = -39 Solving -14 + -2r = -39 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + -2r = -39 + 14 Combine like terms: -14 + 14 = 0 0 + -2r = -39 + 14 -2r = -39 + 14 Combine like terms: -39 + 14 = -25 -2r = -25 Divide each side by '-2'. r = 12.5 Simplifying r = 12.5
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