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Simplifying 5x + 21 = 57 + -4x Reorder the terms: 21 + 5x = 57 + -4x Solving 21 + 5x = 57 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 21 + 5x + 4x = 57 + -4x + 4x Combine like terms: 5x + 4x = 9x 21 + 9x = 57 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 9x = 57 + 0 21 + 9x = 57 Add '-21' to each side of the equation. 21 + -21 + 9x = 57 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = 57 + -21 9x = 57 + -21 Combine like terms: 57 + -21 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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