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Simplifying -9r + 9 = -10r Reorder the terms: 9 + -9r = -10r Solving 9 + -9r = -10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10r' to each side of the equation. 9 + -9r + 10r = -10r + 10r Combine like terms: -9r + 10r = 1r 9 + 1r = -10r + 10r Combine like terms: -10r + 10r = 0 9 + 1r = 0 Add '-9' to each side of the equation. 9 + -9 + 1r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 1r = 0 + -9 1r = 0 + -9 Combine like terms: 0 + -9 = -9 1r = -9 Divide each side by '1'. r = -9 Simplifying r = -9
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