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Simplifying s + s + (s + 12) + 0.5(s + 12) = 81 Reorder the terms: s + s + (12 + s) + 0.5(s + 12) = 81 Remove parenthesis around (12 + s) s + s + 12 + s + 0.5(s + 12) = 81 Reorder the terms: s + s + 12 + s + 0.5(12 + s) = 81 s + s + 12 + s + (12 * 0.5 + s * 0.5) = 81 s + s + 12 + s + (6 + 0.5s) = 81 Reorder the terms: 12 + 6 + s + s + s + 0.5s = 81 Combine like terms: 12 + 6 = 18 18 + s + s + s + 0.5s = 81 Combine like terms: s + s = 2s 18 + 2s + s + 0.5s = 81 Combine like terms: 2s + s = 3s 18 + 3s + 0.5s = 81 Combine like terms: 3s + 0.5s = 3.5s 18 + 3.5s = 81 Solving 18 + 3.5s = 81 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 3.5s = 81 + -18 Combine like terms: 18 + -18 = 0 0 + 3.5s = 81 + -18 3.5s = 81 + -18 Combine like terms: 81 + -18 = 63 3.5s = 63 Divide each side by '3.5'. s = 18 Simplifying s = 18
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