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Simplifying -15 + 9r = 18r + 12 Reorder the terms: -15 + 9r = 12 + 18r Solving -15 + 9r = 12 + 18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18r' to each side of the equation. -15 + 9r + -18r = 12 + 18r + -18r Combine like terms: 9r + -18r = -9r -15 + -9r = 12 + 18r + -18r Combine like terms: 18r + -18r = 0 -15 + -9r = 12 + 0 -15 + -9r = 12 Add '15' to each side of the equation. -15 + 15 + -9r = 12 + 15 Combine like terms: -15 + 15 = 0 0 + -9r = 12 + 15 -9r = 12 + 15 Combine like terms: 12 + 15 = 27 -9r = 27 Divide each side by '-9'. r = -3 Simplifying r = -3
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