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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 = -1x 21 + -1x = 136 Solving 21 + -1x = 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 + -1x = 136 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 136 + -21 -1x = 136 + -21 Combine like terms: 136 + -21 = 115 -1x = 115 Divide each side by '-1'. x = -115 Simplifying x = -115
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