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Simplifying 126 = 3(2 + 5r) 126 = (2 * 3 + 5r * 3) 126 = (6 + 15r) Solving 126 = 6 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 126 + -15r = 6 + 15r + -15r Combine like terms: 15r + -15r = 0 126 + -15r = 6 + 0 126 + -15r = 6 Add '-126' to each side of the equation. 126 + -126 + -15r = 6 + -126 Combine like terms: 126 + -126 = 0 0 + -15r = 6 + -126 -15r = 6 + -126 Combine like terms: 6 + -126 = -120 -15r = -120 Divide each side by '-15'. r = 8 Simplifying r = 8
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