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Simplifying 2x = (x + 21) Reorder the terms: 2x = (21 + x) Remove parenthesis around (21 + x) 2x = 21 + x Solving 2x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 2x + -1x = 21 + x + -1x Combine like terms: 2x + -1x = 1x 1x = 21 + x + -1x Combine like terms: x + -1x = 0 1x = 21 + 0 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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