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Simplifying 18 = 4r + -2 Reorder the terms: 18 = -2 + 4r Solving 18 = -2 + 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 = -2 + 4r + -4r Combine like terms: 4r + -4r = 0 18 + -4r = -2 + 0 18 + -4r = -2 Add '-18' to each side of the equation. 18 + -18 + -4r = -2 + -18 Combine like terms: 18 + -18 = 0 0 + -4r = -2 + -18 -4r = -2 + -18 Combine like terms: -2 + -18 = -20 -4r = -20 Divide each side by '-4'. r = 5 Simplifying r = 5
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