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Simplifying -3(r + 6) = -31 Reorder the terms: -3(6 + r) = -31 (6 * -3 + r * -3) = -31 (-18 + -3r) = -31 Solving -18 + -3r = -31 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -3r = -31 + 18 Combine like terms: -18 + 18 = 0 0 + -3r = -31 + 18 -3r = -31 + 18 Combine like terms: -31 + 18 = -13 -3r = -13 Divide each side by '-3'. r = 4.333333333 Simplifying r = 4.333333333
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