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Simplifying -2(1r + 7) = -31 Reorder the terms: -2(7 + 1r) = -31 (7 * -2 + 1r * -2) = -31 (-14 + -2r) = -31 Solving -14 + -2r = -31 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 = -31 + 14 Combine like terms: -14 + 14 = 0 0 + -2r = -31 + 14 -2r = -31 + 14 Combine like terms: -31 + 14 = -17 -2r = -17 Divide each side by '-2'. r = 8.5 Simplifying r = 8.5
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