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Simplifying 7r = -1r + 144 Reorder the terms: 7r = 144 + -1r Solving 7r = 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. 7r + r = 144 + -1r + r Combine like terms: 7r + r = 8r 8r = 144 + -1r + r Combine like terms: -1r + r = 0 8r = 144 + 0 8r = 144 Divide each side by '8'. r = 18 Simplifying r = 18
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