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Simplifying -20 + -1r = -31 Solving -20 + -1r = -31 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -1r = -31 + 20 Combine like terms: -20 + 20 = 0 0 + -1r = -31 + 20 -1r = -31 + 20 Combine like terms: -31 + 20 = -11 -1r = -11 Divide each side by '-1'. r = 11 Simplifying r = 11
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