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Simplifying 18 = 9r + -18 Reorder the terms: 18 = -18 + 9r Solving 18 = -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 = -18 + 9r + -9r Combine like terms: 9r + -9r = 0 18 + -9r = -18 + 0 18 + -9r = -18 Add '-18' to each side of the equation. 18 + -18 + -9r = -18 + -18 Combine like terms: 18 + -18 = 0 0 + -9r = -18 + -18 -9r = -18 + -18 Combine like terms: -18 + -18 = -36 -9r = -36 Divide each side by '-9'. r = 4 Simplifying r = 4
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