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Simplifying 123 + 2x = x + 21 Reorder the terms: 123 + 2x = 21 + x Solving 123 + 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. 123 + 2x + -1x = 21 + x + -1x Combine like terms: 2x + -1x = 1x 123 + 1x = 21 + x + -1x Combine like terms: x + -1x = 0 123 + 1x = 21 + 0 123 + 1x = 21 Add '-123' to each side of the equation. 123 + -123 + 1x = 21 + -123 Combine like terms: 123 + -123 = 0 0 + 1x = 21 + -123 1x = 21 + -123 Combine like terms: 21 + -123 = -102 1x = -102 Divide each side by '1'. x = -102 Simplifying x = -102
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