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Simplifying -4.2 + 8.1x + -3.9 = 0 Reorder the terms: -4.2 + -3.9 + 8.1x = 0 Combine like terms: -4.2 + -3.9 = -8.1 -8.1 + 8.1x = 0 Solving -8.1 + 8.1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.1' to each side of the equation. -8.1 + 8.1 + 8.1x = 0 + 8.1 Combine like terms: -8.1 + 8.1 = 0.0 0.0 + 8.1x = 0 + 8.1 8.1x = 0 + 8.1 Combine like terms: 0 + 8.1 = 8.1 8.1x = 8.1 Divide each side by '8.1'. x = 1 Simplifying x = 1
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