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Simplifying 12x + -21 = 4x + -21 Reorder the terms: -21 + 12x = 4x + -21 Reorder the terms: -21 + 12x = -21 + 4x Add '21' to each side of the equation. -21 + 21 + 12x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 0 + 12x = -21 + 21 + 4x 12x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 12x = 0 + 4x 12x = 4x Solving 12x = 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. 12x + -4x = 4x + -4x Combine like terms: 12x + -4x = 8x 8x = 4x + -4x Combine like terms: 4x + -4x = 0 8x = 0 Divide each side by '8'. x = 0 Simplifying x = 0
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