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Simplifying 68 = 9r + 77 Reorder the terms: 68 = 77 + 9r Solving 68 = 77 + 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. 68 + -9r = 77 + 9r + -9r Combine like terms: 9r + -9r = 0 68 + -9r = 77 + 0 68 + -9r = 77 Add '-68' to each side of the equation. 68 + -68 + -9r = 77 + -68 Combine like terms: 68 + -68 = 0 0 + -9r = 77 + -68 -9r = 77 + -68 Combine like terms: 77 + -68 = 9 -9r = 9 Divide each side by '-9'. r = -1 Simplifying r = -1
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