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Simplifying 5x + -21 = 4x + -21 Reorder the terms: -21 + 5x = 4x + -21 Reorder the terms: -21 + 5x = -21 + 4x Add '21' to each side of the equation. -21 + 21 + 5x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 0 + 5x = -21 + 21 + 4x 5x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 5x = 0 + 4x 5x = 4x Solving 5x = 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. 5x + -4x = 4x + -4x Combine like terms: 5x + -4x = 1x 1x = 4x + -4x Combine like terms: 4x + -4x = 0 1x = 0 Divide each side by '1'. x = 0 Simplifying x = 0
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