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Simplifying -18 = 7r + 2r Combine like terms: 7r + 2r = 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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