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Simplifying -1x + 90 + 30 = 100 Reorder the terms: 90 + 30 + -1x = 100 Combine like terms: 90 + 30 = 120 120 + -1x = 100 Solving 120 + -1x = 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 + -1x = 100 + -120 Combine like terms: 120 + -120 = 0 0 + -1x = 100 + -120 -1x = 100 + -120 Combine like terms: 100 + -120 = -20 -1x = -20 Divide each side by '-1'. x = 20 Simplifying x = 20
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