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Simplifying (x + 21) + 2x = 136 Reorder the terms: (21 + x) + 2x = 136 Remove parenthesis around (21 + x) 21 + x + 2x = 136 Combine like terms: x + 2x = 3x 21 + 3x = 136 Solving 21 + 3x = 136 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 = 136 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 136 + -21 3x = 136 + -21 Combine like terms: 136 + -21 = 115 3x = 115 Divide each side by '3'. x = 38.33333333 Simplifying x = 38.33333333
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