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Simplifying 99 = 9r Solving 99 = 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. 99 + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 99 + -9r = 0 Add '-99' to each side of the equation. 99 + -99 + -9r = 0 + -99 Combine like terms: 99 + -99 = 0 0 + -9r = 0 + -99 -9r = 0 + -99 Combine like terms: 0 + -99 = -99 -9r = -99 Divide each side by '-9'. r = 11 Simplifying r = 11
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