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Simplifying x + (2x + 9) = 90 Reorder the terms: x + (9 + 2x) = 90 Remove parenthesis around (9 + 2x) x + 9 + 2x = 90 Reorder the terms: 9 + x + 2x = 90 Combine like terms: x + 2x = 3x 9 + 3x = 90 Solving 9 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 90 + -9 3x = 90 + -9 Combine like terms: 90 + -9 = 81 3x = 81 Divide each side by '3'. x = 27 Simplifying x = 27
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