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Simplifying 1 = 10 + 9r Solving 1 = 10 + 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. 1 + -9r = 10 + 9r + -9r Combine like terms: 9r + -9r = 0 1 + -9r = 10 + 0 1 + -9r = 10 Add '-1' to each side of the equation. 1 + -1 + -9r = 10 + -1 Combine like terms: 1 + -1 = 0 0 + -9r = 10 + -1 -9r = 10 + -1 Combine like terms: 10 + -1 = 9 -9r = 9 Divide each side by '-9'. r = -1 Simplifying r = -1
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