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Simplifying 20 = -7 + 3(r + 6) Reorder the terms: 20 = -7 + 3(6 + r) 20 = -7 + (6 * 3 + r * 3) 20 = -7 + (18 + 3r) Combine like terms: -7 + 18 = 11 20 = 11 + 3r Solving 20 = 11 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 20 + -3r = 11 + 3r + -3r Combine like terms: 3r + -3r = 0 20 + -3r = 11 + 0 20 + -3r = 11 Add '-20' to each side of the equation. 20 + -20 + -3r = 11 + -20 Combine like terms: 20 + -20 = 0 0 + -3r = 11 + -20 -3r = 11 + -20 Combine like terms: 11 + -20 = -9 -3r = -9 Divide each side by '-3'. r = 3 Simplifying r = 3
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