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Simplifying 18 = 30 + -1r(30) Reorder the terms for easier multiplication: 18 = 30 + -1 * 30r Multiply -1 * 30 18 = 30 + -30r Solving 18 = 30 + -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. 18 + 30r = 30 + -30r + 30r Combine like terms: -30r + 30r = 0 18 + 30r = 30 + 0 18 + 30r = 30 Add '-18' to each side of the equation. 18 + -18 + 30r = 30 + -18 Combine like terms: 18 + -18 = 0 0 + 30r = 30 + -18 30r = 30 + -18 Combine like terms: 30 + -18 = 12 30r = 12 Divide each side by '30'. r = 0.4 Simplifying r = 0.4
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