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Simplifying 18 + -1r = 20 Solving 18 + -1r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. 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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