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Simplifying 18 = -7r + 3r Combine like terms: -7r + 3r = -4r 18 = -4r Solving 18 = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 18 + 4r = -4r + 4r Combine like terms: -4r + 4r = 0 18 + 4r = 0 Add '-18' to each side of the equation. 18 + -18 + 4r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 4r = 0 + -18 4r = 0 + -18 Combine like terms: 0 + -18 = -18 4r = -18 Divide each side by '4'. r = -4.5 Simplifying r = -4.5
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