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Simplifying 18 = r + -20 Reorder the terms: 18 = -20 + r Solving 18 = -20 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 18 + -1r = -20 + r + -1r Combine like terms: r + -1r = 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 = -38 -1r = -38 Divide each side by '-1'. r = 38 Simplifying r = 38
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