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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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