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Simplifying 18 = -4r + 7r Combine like terms: -4r + 7r = 3r 18 = 3r Solving 18 = 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. 18 + -3r = 3r + -3r Combine like terms: 3r + -3r = 0 18 + -3r = 0 Add '-18' to each side of the equation. 18 + -18 + -3r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -3r = 0 + -18 -3r = 0 + -18 Combine like terms: 0 + -18 = -18 -3r = -18 Divide each side by '-3'. r = 6 Simplifying r = 6
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