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Simplifying 90X + -120(1 + -1X) = 100 90X + (1 * -120 + -1X * -120) = 100 90X + (-120 + 120X) = 100 Reorder the terms: -120 + 90X + 120X = 100 Combine like terms: 90X + 120X = 210X -120 + 210X = 100 Solving -120 + 210X = 100 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '120' to each side of the equation. -120 + 120 + 210X = 100 + 120 Combine like terms: -120 + 120 = 0 0 + 210X = 100 + 120 210X = 100 + 120 Combine like terms: 100 + 120 = 220 210X = 220 Divide each side by '210'. X = 1.047619048 Simplifying X = 1.047619048
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