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Simplifying -20 = -3 + 5(r + 9) Reorder the terms: -20 = -3 + 5(9 + r) -20 = -3 + (9 * 5 + r * 5) -20 = -3 + (45 + 5r) Combine like terms: -3 + 45 = 42 -20 = 42 + 5r Solving -20 = 42 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -20 + -5r = 42 + 5r + -5r Combine like terms: 5r + -5r = 0 -20 + -5r = 42 + 0 -20 + -5r = 42 Add '20' to each side of the equation. -20 + 20 + -5r = 42 + 20 Combine like terms: -20 + 20 = 0 0 + -5r = 42 + 20 -5r = 42 + 20 Combine like terms: 42 + 20 = 62 -5r = 62 Divide each side by '-5'. r = -12.4 Simplifying r = -12.4
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