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Simplifying 7(4s + 9) = 399 Reorder the terms: 7(9 + 4s) = 399 (9 * 7 + 4s * 7) = 399 (63 + 28s) = 399 Solving 63 + 28s = 399 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 + 28s = 399 + -63 Combine like terms: 63 + -63 = 0 0 + 28s = 399 + -63 28s = 399 + -63 Combine like terms: 399 + -63 = 336 28s = 336 Divide each side by '28'. s = 12 Simplifying s = 12
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