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