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90x=100x+20
We move all terms to the left:
90x-(100x+20)=0
We get rid of parentheses
90x-100x-20=0
We add all the numbers together, and all the variables
-10x-20=0
We move all terms containing x to the left, all other terms to the right
-10x=20
x=20/-10
x=-2
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