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Simplifying -2(r + 6) = 72 Reorder the terms: -2(6 + r) = 72 (6 * -2 + r * -2) = 72 (-12 + -2r) = 72 Solving -12 + -2r = 72 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -2r = 72 + 12 Combine like terms: -12 + 12 = 0 0 + -2r = 72 + 12 -2r = 72 + 12 Combine like terms: 72 + 12 = 84 -2r = 84 Divide each side by '-2'. r = -42 Simplifying r = -42
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