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Simplifying 2x + (x + 39) = 90 Reorder the terms: 2x + (39 + x) = 90 Remove parenthesis around (39 + x) 2x + 39 + x = 90 Reorder the terms: 39 + 2x + x = 90 Combine like terms: 2x + x = 3x 39 + 3x = 90 Solving 39 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 3x = 90 + -39 Combine like terms: 39 + -39 = 0 0 + 3x = 90 + -39 3x = 90 + -39 Combine like terms: 90 + -39 = 51 3x = 51 Divide each side by '3'. x = 17 Simplifying x = 17
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