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20x-250=50x-100
We move all terms to the left:
20x-250-(50x-100)=0
We get rid of parentheses
20x-50x+100-250=0
We add all the numbers together, and all the variables
-30x-150=0
We move all terms containing x to the left, all other terms to the right
-30x=150
x=150/-30
x=-5
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