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Simplifying 90 = 0.2(100 + X) 90 = (100 * 0.2 + X * 0.2) 90 = (20 + 0.2X) Solving 90 = 20 + 0.2X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2X' to each side of the equation. 90 + -0.2X = 20 + 0.2X + -0.2X Combine like terms: 0.2X + -0.2X = 0.0 90 + -0.2X = 20 + 0.0 90 + -0.2X = 20 Add '-90' to each side of the equation. 90 + -90 + -0.2X = 20 + -90 Combine like terms: 90 + -90 = 0 0 + -0.2X = 20 + -90 -0.2X = 20 + -90 Combine like terms: 20 + -90 = -70 -0.2X = -70 Divide each side by '-0.2'. X = 350 Simplifying X = 350
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