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Simplifying 13 = 3(22 + -1r) 13 = (22 * 3 + -1r * 3) 13 = (66 + -3r) Solving 13 = 66 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 13 + 3r = 66 + -3r + 3r Combine like terms: -3r + 3r = 0 13 + 3r = 66 + 0 13 + 3r = 66 Add '-13' to each side of the equation. 13 + -13 + 3r = 66 + -13 Combine like terms: 13 + -13 = 0 0 + 3r = 66 + -13 3r = 66 + -13 Combine like terms: 66 + -13 = 53 3r = 53 Divide each side by '3'. r = 17.66666667 Simplifying r = 17.66666667
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