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Simplifying 11 + -1r = 20 Solving 11 + -1r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1r = 20 + -11 Combine like terms: 11 + -11 = 0 0 + -1r = 20 + -11 -1r = 20 + -11 Combine like terms: 20 + -11 = 9 -1r = 9 Divide each side by '-1'. r = -9 Simplifying r = -9
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