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Simplifying 6x + -4x + 21 = 57 Reorder the terms: 21 + 6x + -4x = 57 Combine like terms: 6x + -4x = 2x 21 + 2x = 57 Solving 21 + 2x = 57 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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