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Simplifying 400 = 2X * 40 Reorder the terms for easier multiplication: 400 = 2 * 40X Multiply 2 * 40 400 = 80X Solving 400 = 80X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-80X' to each side of the equation. 400 + -80X = 80X + -80X Combine like terms: 80X + -80X = 0 400 + -80X = 0 Add '-400' to each side of the equation. 400 + -400 + -80X = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -80X = 0 + -400 -80X = 0 + -400 Combine like terms: 0 + -400 = -400 -80X = -400 Divide each side by '-80'. X = 5 Simplifying X = 5
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