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Simplifying -2r + 18 + -9 = -18 + 7r Reorder the terms: 18 + -9 + -2r = -18 + 7r Combine like terms: 18 + -9 = 9 9 + -2r = -18 + 7r Solving 9 + -2r = -18 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 9 + -2r + -7r = -18 + 7r + -7r Combine like terms: -2r + -7r = -9r 9 + -9r = -18 + 7r + -7r Combine like terms: 7r + -7r = 0 9 + -9r = -18 + 0 9 + -9r = -18 Add '-9' to each side of the equation. 9 + -9 + -9r = -18 + -9 Combine like terms: 9 + -9 = 0 0 + -9r = -18 + -9 -9r = -18 + -9 Combine like terms: -18 + -9 = -27 -9r = -27 Divide each side by '-9'. r = 3 Simplifying r = 3
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