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Simplifying 2r + -18 = 45 + 9r Reorder the terms: -18 + 2r = 45 + 9r Solving -18 + 2r = 45 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -18 + 2r + -9r = 45 + 9r + -9r Combine like terms: 2r + -9r = -7r -18 + -7r = 45 + 9r + -9r Combine like terms: 9r + -9r = 0 -18 + -7r = 45 + 0 -18 + -7r = 45 Add '18' to each side of the equation. -18 + 18 + -7r = 45 + 18 Combine like terms: -18 + 18 = 0 0 + -7r = 45 + 18 -7r = 45 + 18 Combine like terms: 45 + 18 = 63 -7r = 63 Divide each side by '-7'. r = -9 Simplifying r = -9
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