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Simplifying (100 + -1X) * 0.4 = X Reorder the terms for easier multiplication: 0.4(100 + -1X) = X (100 * 0.4 + -1X * 0.4) = X (40 + -0.4X) = X Solving 40 + -0.4X = X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1X' to each side of the equation. 40 + -0.4X + -1X = X + -1X Combine like terms: -0.4X + -1X = -1.4X 40 + -1.4X = X + -1X Combine like terms: X + -1X = 0 40 + -1.4X = 0 Add '-40' to each side of the equation. 40 + -40 + -1.4X = 0 + -40 Combine like terms: 40 + -40 = 0 0 + -1.4X = 0 + -40 -1.4X = 0 + -40 Combine like terms: 0 + -40 = -40 -1.4X = -40 Divide each side by '-1.4'. X = 28.57142857 Simplifying X = 28.57142857
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