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Simplifying 9r + -8 = 7r + 18 Reorder the terms: -8 + 9r = 7r + 18 Reorder the terms: -8 + 9r = 18 + 7r Solving -8 + 9r = 18 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -8 + 9r + -7r = 18 + 7r + -7r Combine like terms: 9r + -7r = 2r -8 + 2r = 18 + 7r + -7r Combine like terms: 7r + -7r = 0 -8 + 2r = 18 + 0 -8 + 2r = 18 Add '8' to each side of the equation. -8 + 8 + 2r = 18 + 8 Combine like terms: -8 + 8 = 0 0 + 2r = 18 + 8 2r = 18 + 8 Combine like terms: 18 + 8 = 26 2r = 26 Divide each side by '2'. r = 13 Simplifying r = 13
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