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Simplifying 180 = 3(r + -9) Reorder the terms: 180 = 3(-9 + r) 180 = (-9 * 3 + r * 3) 180 = (-27 + 3r) Solving 180 = -27 + 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. 180 + -3r = -27 + 3r + -3r Combine like terms: 3r + -3r = 0 180 + -3r = -27 + 0 180 + -3r = -27 Add '-180' to each side of the equation. 180 + -180 + -3r = -27 + -180 Combine like terms: 180 + -180 = 0 0 + -3r = -27 + -180 -3r = -27 + -180 Combine like terms: -27 + -180 = -207 -3r = -207 Divide each side by '-3'. r = 69 Simplifying r = 69
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