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Simplifying -3r + 18 + -20r = -18 + -20r Reorder the terms: 18 + -3r + -20r = -18 + -20r Combine like terms: -3r + -20r = -23r 18 + -23r = -18 + -20r Solving 18 + -23r = -18 + -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. 18 + -23r + 20r = -18 + -20r + 20r Combine like terms: -23r + 20r = -3r 18 + -3r = -18 + -20r + 20r Combine like terms: -20r + 20r = 0 18 + -3r = -18 + 0 18 + -3r = -18 Add '-18' to each side of the equation. 18 + -18 + -3r = -18 + -18 Combine like terms: 18 + -18 = 0 0 + -3r = -18 + -18 -3r = -18 + -18 Combine like terms: -18 + -18 = -36 -3r = -36 Divide each side by '-3'. r = 12 Simplifying r = 12
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