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Simplifying 108 = 18 + -30r Solving 108 = 18 + -30r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30r' to each side of the equation. 108 + 30r = 18 + -30r + 30r Combine like terms: -30r + 30r = 0 108 + 30r = 18 + 0 108 + 30r = 18 Add '-108' to each side of the equation. 108 + -108 + 30r = 18 + -108 Combine like terms: 108 + -108 = 0 0 + 30r = 18 + -108 30r = 18 + -108 Combine like terms: 18 + -108 = -90 30r = -90 Divide each side by '30'. r = -3 Simplifying r = -3
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