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Simplifying 3(4s + 7) = 129 Reorder the terms: 3(7 + 4s) = 129 (7 * 3 + 4s * 3) = 129 (21 + 12s) = 129 Solving 21 + 12s = 129 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 12s = 129 + -21 Combine like terms: 21 + -21 = 0 0 + 12s = 129 + -21 12s = 129 + -21 Combine like terms: 129 + -21 = 108 12s = 108 Divide each side by '12'. s = 9 Simplifying s = 9
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