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Simplifying 0.8x + -400 = 4x Reorder the terms: -400 + 0.8x = 4x Solving -400 + 0.8x = 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. -400 + 0.8x + -4x = 4x + -4x Combine like terms: 0.8x + -4x = -3.2x -400 + -3.2x = 4x + -4x Combine like terms: 4x + -4x = 0 -400 + -3.2x = 0 Add '400' to each side of the equation. -400 + 400 + -3.2x = 0 + 400 Combine like terms: -400 + 400 = 0 0 + -3.2x = 0 + 400 -3.2x = 0 + 400 Combine like terms: 0 + 400 = 400 -3.2x = 400 Divide each side by '-3.2'. x = -125 Simplifying x = -125
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