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Simplifying 124 = 7(2r + 8) + 3r Reorder the terms: 124 = 7(8 + 2r) + 3r 124 = (8 * 7 + 2r * 7) + 3r 124 = (56 + 14r) + 3r Combine like terms: 14r + 3r = 17r 124 = 56 + 17r Solving 124 = 56 + 17r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17r' to each side of the equation. 124 + -17r = 56 + 17r + -17r Combine like terms: 17r + -17r = 0 124 + -17r = 56 + 0 124 + -17r = 56 Add '-124' to each side of the equation. 124 + -124 + -17r = 56 + -124 Combine like terms: 124 + -124 = 0 0 + -17r = 56 + -124 -17r = 56 + -124 Combine like terms: 56 + -124 = -68 -17r = -68 Divide each side by '-17'. r = 4 Simplifying r = 4
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