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Simplifying 4000 + -400x + -800x = 0 Combine like terms: -400x + -800x = -1200x 4000 + -1200x = 0 Solving 4000 + -1200x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4000' to each side of the equation. 4000 + -4000 + -1200x = 0 + -4000 Combine like terms: 4000 + -4000 = 0 0 + -1200x = 0 + -4000 -1200x = 0 + -4000 Combine like terms: 0 + -4000 = -4000 -1200x = -4000 Divide each side by '-1200'. x = 3.333333333 Simplifying x = 3.333333333
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