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Simplifying 7(3s + 4) = 280 Reorder the terms: 7(4 + 3s) = 280 (4 * 7 + 3s * 7) = 280 (28 + 21s) = 280 Solving 28 + 21s = 280 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 21s = 280 + -28 Combine like terms: 28 + -28 = 0 0 + 21s = 280 + -28 21s = 280 + -28 Combine like terms: 280 + -28 = 252 21s = 252 Divide each side by '21'. s = 12 Simplifying s = 12
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