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Simplifying -20 = -5 + 8(r + 9) Reorder the terms: -20 = -5 + 8(9 + r) -20 = -5 + (9 * 8 + r * 8) -20 = -5 + (72 + 8r) Combine like terms: -5 + 72 = 67 -20 = 67 + 8r Solving -20 = 67 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -20 + -8r = 67 + 8r + -8r Combine like terms: 8r + -8r = 0 -20 + -8r = 67 + 0 -20 + -8r = 67 Add '20' to each side of the equation. -20 + 20 + -8r = 67 + 20 Combine like terms: -20 + 20 = 0 0 + -8r = 67 + 20 -8r = 67 + 20 Combine like terms: 67 + 20 = 87 -8r = 87 Divide each side by '-8'. r = -10.875 Simplifying r = -10.875
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