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Simplifying 3x + 21 = x + 57 Reorder the terms: 21 + 3x = x + 57 Reorder the terms: 21 + 3x = 57 + x Solving 21 + 3x = 57 + 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 = 57 + x + -1x Combine like terms: 3x + -1x = 2x 21 + 2x = 57 + x + -1x Combine like terms: x + -1x = 0 21 + 2x = 57 + 0 21 + 2x = 57 Add '-21' to each side of the equation. 21 + -21 + 2x = 57 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 57 + -21 2x = 57 + -21 Combine like terms: 57 + -21 = 36 2x = 36 Divide each side by '2'. x = 18 Simplifying x = 18
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