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Simplifying -21x(-4) = 0 Reorder the terms for easier multiplication: -21 * -4x = 0 Multiply -21 * -4 84x = 0 Solving 84x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '84'. x = 0 Simplifying x = 0
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