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Simplifying 144 = -1r + -2r Combine like terms: -1r + -2r = -3r 144 = -3r Solving 144 = -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. 144 + 3r = -3r + 3r Combine like terms: -3r + 3r = 0 144 + 3r = 0 Add '-144' to each side of the equation. 144 + -144 + 3r = 0 + -144 Combine like terms: 144 + -144 = 0 0 + 3r = 0 + -144 3r = 0 + -144 Combine like terms: 0 + -144 = -144 3r = -144 Divide each side by '3'. r = -48 Simplifying r = -48
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