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Simplifying 21 + 4x = -3x + 21 Reorder the terms: 21 + 4x = 21 + -3x Add '-21' to each side of the equation. 21 + -21 + 4x = 21 + -21 + -3x Combine like terms: 21 + -21 = 0 0 + 4x = 21 + -21 + -3x 4x = 21 + -21 + -3x Combine like terms: 21 + -21 = 0 4x = 0 + -3x 4x = -3x Solving 4x = -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 4x + 3x = -3x + 3x Combine like terms: 4x + 3x = 7x 7x = -3x + 3x Combine like terms: -3x + 3x = 0 7x = 0 Divide each side by '7'. x = 0 Simplifying x = 0
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