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Simplifying 2x + (21 + x) = 90 Remove parenthesis around (21 + x) 2x + 21 + x = 90 Reorder the terms: 21 + 2x + x = 90 Combine like terms: 2x + x = 3x 21 + 3x = 90 Solving 21 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 90 + -21 3x = 90 + -21 Combine like terms: 90 + -21 = 69 3x = 69 Divide each side by '3'. x = 23 Simplifying x = 23
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