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Simplifying -2(r + 3) = -31 Reorder the terms: -2(3 + r) = -31 (3 * -2 + r * -2) = -31 (-6 + -2r) = -31 Solving -6 + -2r = -31 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -2r = -31 + 6 Combine like terms: -6 + 6 = 0 0 + -2r = -31 + 6 -2r = -31 + 6 Combine like terms: -31 + 6 = -25 -2r = -25 Divide each side by '-2'. r = 12.5 Simplifying r = 12.5
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