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Simplifying 3(6 + 2r) = 8r + -20 (6 * 3 + 2r * 3) = 8r + -20 (18 + 6r) = 8r + -20 Reorder the terms: 18 + 6r = -20 + 8r Solving 18 + 6r = -20 + 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. 18 + 6r + -8r = -20 + 8r + -8r Combine like terms: 6r + -8r = -2r 18 + -2r = -20 + 8r + -8r Combine like terms: 8r + -8r = 0 18 + -2r = -20 + 0 18 + -2r = -20 Add '-18' to each side of the equation. 18 + -18 + -2r = -20 + -18 Combine like terms: 18 + -18 = 0 0 + -2r = -20 + -18 -2r = -20 + -18 Combine like terms: -20 + -18 = -38 -2r = -38 Divide each side by '-2'. r = 19 Simplifying r = 19
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