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Simplifying (s + 12) + s = 390 Reorder the terms: (12 + s) + s = 390 Remove parenthesis around (12 + s) 12 + s + s = 390 Combine like terms: s + s = 2s 12 + 2s = 390 Solving 12 + 2s = 390 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2s = 390 + -12 Combine like terms: 12 + -12 = 0 0 + 2s = 390 + -12 2s = 390 + -12 Combine like terms: 390 + -12 = 378 2s = 378 Divide each side by '2'. s = 189 Simplifying s = 189
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