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Simplifying 11 = 18 + 3r + 4r Combine like terms: 3r + 4r = 7r 11 = 18 + 7r Solving 11 = 18 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 11 + -7r = 18 + 7r + -7r Combine like terms: 7r + -7r = 0 11 + -7r = 18 + 0 11 + -7r = 18 Add '-11' to each side of the equation. 11 + -11 + -7r = 18 + -11 Combine like terms: 11 + -11 = 0 0 + -7r = 18 + -11 -7r = 18 + -11 Combine like terms: 18 + -11 = 7 -7r = 7 Divide each side by '-7'. r = -1 Simplifying r = -1
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