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Simplifying 13 + 20r = 11r + 76 Reorder the terms: 13 + 20r = 76 + 11r Solving 13 + 20r = 76 + 11r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11r' to each side of the equation. 13 + 20r + -11r = 76 + 11r + -11r Combine like terms: 20r + -11r = 9r 13 + 9r = 76 + 11r + -11r Combine like terms: 11r + -11r = 0 13 + 9r = 76 + 0 13 + 9r = 76 Add '-13' to each side of the equation. 13 + -13 + 9r = 76 + -13 Combine like terms: 13 + -13 = 0 0 + 9r = 76 + -13 9r = 76 + -13 Combine like terms: 76 + -13 = 63 9r = 63 Divide each side by '9'. r = 7 Simplifying r = 7
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