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Simplifying 18 = 7r + -8r Combine like terms: 7r + -8r = -1r 18 = -1r Solving 18 = -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. 18 + r = -1r + r Combine like terms: -1r + r = 0 18 + r = 0 Add '-18' to each side of the equation. 18 + -18 + r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + r = 0 + -18 r = 0 + -18 Combine like terms: 0 + -18 = -18 r = -18 Simplifying r = -18
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