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Simplifying 20 = -8 + 9(r + 3) Reorder the terms: 20 = -8 + 9(3 + r) 20 = -8 + (3 * 9 + r * 9) 20 = -8 + (27 + 9r) Combine like terms: -8 + 27 = 19 20 = 19 + 9r Solving 20 = 19 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 20 + -9r = 19 + 9r + -9r Combine like terms: 9r + -9r = 0 20 + -9r = 19 + 0 20 + -9r = 19 Add '-20' to each side of the equation. 20 + -20 + -9r = 19 + -20 Combine like terms: 20 + -20 = 0 0 + -9r = 19 + -20 -9r = 19 + -20 Combine like terms: 19 + -20 = -1 -9r = -1 Divide each side by '-9'. r = 0.1111111111 Simplifying r = 0.1111111111
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