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Simplifying 21 + x = 2x + 23 Reorder the terms: 21 + x = 23 + 2x Solving 21 + x = 23 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 21 + x + -2x = 23 + 2x + -2x Combine like terms: x + -2x = -1x 21 + -1x = 23 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + -1x = 23 + 0 21 + -1x = 23 Add '-21' to each side of the equation. 21 + -21 + -1x = 23 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 23 + -21 -1x = 23 + -21 Combine like terms: 23 + -21 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2
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