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Simplifying 9 + 9r + -1 = 9r + 20 + -2r Reorder the terms: 9 + -1 + 9r = 9r + 20 + -2r Combine like terms: 9 + -1 = 8 8 + 9r = 9r + 20 + -2r Reorder the terms: 8 + 9r = 20 + 9r + -2r Combine like terms: 9r + -2r = 7r 8 + 9r = 20 + 7r Solving 8 + 9r = 20 + 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 = 20 + 7r + -7r Combine like terms: 9r + -7r = 2r 8 + 2r = 20 + 7r + -7r Combine like terms: 7r + -7r = 0 8 + 2r = 20 + 0 8 + 2r = 20 Add '-8' to each side of the equation. 8 + -8 + 2r = 20 + -8 Combine like terms: 8 + -8 = 0 0 + 2r = 20 + -8 2r = 20 + -8 Combine like terms: 20 + -8 = 12 2r = 12 Divide each side by '2'. r = 6 Simplifying r = 6
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