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Simplifying -3.1r + 15 = -18.1r Reorder the terms: 15 + -3.1r = -18.1r Solving 15 + -3.1r = -18.1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18.1r' to each side of the equation. 15 + -3.1r + 18.1r = -18.1r + 18.1r Combine like terms: -3.1r + 18.1r = 15r 15 + 15r = -18.1r + 18.1r Combine like terms: -18.1r + 18.1r = 0.0 15 + 15r = 0.0 Add '-15' to each side of the equation. 15 + -15 + 15r = 0.0 + -15 Combine like terms: 15 + -15 = 0 0 + 15r = 0.0 + -15 15r = 0.0 + -15 Combine like terms: 0.0 + -15 = -15 15r = -15 Divide each side by '15'. r = -1 Simplifying r = -1
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