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Simplifying 144 = 1r + -2r Combine like terms: 1r + -2r = -1r 144 = -1r Solving 144 = -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 144 + r = -1r + r Combine like terms: -1r + r = 0 144 + r = 0 Add '-144' to each side of the equation. 144 + -144 + r = 0 + -144 Combine like terms: 144 + -144 = 0 0 + r = 0 + -144 r = 0 + -144 Combine like terms: 0 + -144 = -144 r = -144 Simplifying r = -144
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