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Simplifying 31 = 15r + -18 Reorder the terms: 31 = -18 + 15r Solving 31 = -18 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 31 + -15r = -18 + 15r + -15r Combine like terms: 15r + -15r = 0 31 + -15r = -18 + 0 31 + -15r = -18 Add '-31' to each side of the equation. 31 + -31 + -15r = -18 + -31 Combine like terms: 31 + -31 = 0 0 + -15r = -18 + -31 -15r = -18 + -31 Combine like terms: -18 + -31 = -49 -15r = -49 Divide each side by '-15'. r = 3.266666667 Simplifying r = 3.266666667
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