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Simplifying 15 = -7 + 2(r + -9) Reorder the terms: 15 = -7 + 2(-9 + r) 15 = -7 + (-9 * 2 + r * 2) 15 = -7 + (-18 + 2r) Combine like terms: -7 + -18 = -25 15 = -25 + 2r Solving 15 = -25 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 15 + -2r = -25 + 2r + -2r Combine like terms: 2r + -2r = 0 15 + -2r = -25 + 0 15 + -2r = -25 Add '-15' to each side of the equation. 15 + -15 + -2r = -25 + -15 Combine like terms: 15 + -15 = 0 0 + -2r = -25 + -15 -2r = -25 + -15 Combine like terms: -25 + -15 = -40 -2r = -40 Divide each side by '-2'. r = 20 Simplifying r = 20
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