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Simplifying 39 = 15 + (2s + 6) Reorder the terms: 39 = 15 + (6 + 2s) Remove parenthesis around (6 + 2s) 39 = 15 + 6 + 2s Combine like terms: 15 + 6 = 21 39 = 21 + 2s Solving 39 = 21 + 2s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-2s' to each side of the equation. 39 + -2s = 21 + 2s + -2s Combine like terms: 2s + -2s = 0 39 + -2s = 21 + 0 39 + -2s = 21 Add '-39' to each side of the equation. 39 + -39 + -2s = 21 + -39 Combine like terms: 39 + -39 = 0 0 + -2s = 21 + -39 -2s = 21 + -39 Combine like terms: 21 + -39 = -18 -2s = -18 Divide each side by '-2'. s = 9 Simplifying s = 9
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