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Simplifying 3r + -18 = -20 + 2r Reorder the terms: -18 + 3r = -20 + 2r Solving -18 + 3r = -20 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -18 + 3r + -2r = -20 + 2r + -2r Combine like terms: 3r + -2r = 1r -18 + 1r = -20 + 2r + -2r Combine like terms: 2r + -2r = 0 -18 + 1r = -20 + 0 -18 + 1r = -20 Add '18' to each side of the equation. -18 + 18 + 1r = -20 + 18 Combine like terms: -18 + 18 = 0 0 + 1r = -20 + 18 1r = -20 + 18 Combine like terms: -20 + 18 = -2 1r = -2 Divide each side by '1'. r = -2 Simplifying r = -2
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