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Simplifying 100 + -1x = 80 Solving 100 + -1x = 80 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + -1x = 80 + -100 Combine like terms: 100 + -100 = 0 0 + -1x = 80 + -100 -1x = 80 + -100 Combine like terms: 80 + -100 = -20 -1x = -20 Divide each side by '-1'. x = 20 Simplifying x = 20
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