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Simplifying -9(r + -1) + r = 20 Reorder the terms: -9(-1 + r) + r = 20 (-1 * -9 + r * -9) + r = 20 (9 + -9r) + r = 20 Combine like terms: -9r + r = -8r 9 + -8r = 20 Solving 9 + -8r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -8r = 20 + -9 Combine like terms: 9 + -9 = 0 0 + -8r = 20 + -9 -8r = 20 + -9 Combine like terms: 20 + -9 = 11 -8r = 11 Divide each side by '-8'. r = -1.375 Simplifying r = -1.375
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