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Simplifying 7(3s + 9) = 279 Reorder the terms: 7(9 + 3s) = 279 (9 * 7 + 3s * 7) = 279 (63 + 21s) = 279 Solving 63 + 21s = 279 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 21s = 279 + -63 Combine like terms: 63 + -63 = 0 0 + 21s = 279 + -63 21s = 279 + -63 Combine like terms: 279 + -63 = 216 21s = 216 Divide each side by '21'. s = 10.28571429 Simplifying s = 10.28571429
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