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Simplifying 21 + 3x = x + 1 Reorder the terms: 21 + 3x = 1 + x Solving 21 + 3x = 1 + 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. 21 + 3x + -1x = 1 + x + -1x Combine like terms: 3x + -1x = 2x 21 + 2x = 1 + x + -1x Combine like terms: x + -1x = 0 21 + 2x = 1 + 0 21 + 2x = 1 Add '-21' to each side of the equation. 21 + -21 + 2x = 1 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 1 + -21 2x = 1 + -21 Combine like terms: 1 + -21 = -20 2x = -20 Divide each side by '2'. x = -10 Simplifying x = -10
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