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