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Simplifying 10r + 9 = r + 81 Reorder the terms: 9 + 10r = r + 81 Reorder the terms: 9 + 10r = 81 + r Solving 9 + 10r = 81 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 9 + 10r + -1r = 81 + r + -1r Combine like terms: 10r + -1r = 9r 9 + 9r = 81 + r + -1r Combine like terms: r + -1r = 0 9 + 9r = 81 + 0 9 + 9r = 81 Add '-9' to each side of the equation. 9 + -9 + 9r = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 9r = 81 + -9 9r = 81 + -9 Combine like terms: 81 + -9 = 72 9r = 72 Divide each side by '9'. r = 8 Simplifying r = 8
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