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