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Simplifying 2s + (7s + -18) = 90 Reorder the terms: 2s + (-18 + 7s) = 90 Remove parenthesis around (-18 + 7s) 2s + -18 + 7s = 90 Reorder the terms: -18 + 2s + 7s = 90 Combine like terms: 2s + 7s = 9s -18 + 9s = 90 Solving -18 + 9s = 90 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 + 9s = 90 + 18 Combine like terms: -18 + 18 = 0 0 + 9s = 90 + 18 9s = 90 + 18 Combine like terms: 90 + 18 = 108 9s = 108 Divide each side by '9'. s = 12 Simplifying s = 12
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