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Simplifying 84 + 4.2x = 0 Solving 84 + 4.2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 4.2x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 4.2x = 0 + -84 4.2x = 0 + -84 Combine like terms: 0 + -84 = -84 4.2x = -84 Divide each side by '4.2'. x = -20 Simplifying x = -20
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