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90=100x-10x
We move all terms to the left:
90-(100x-10x)=0
We add all the numbers together, and all the variables
-(+90x)+90=0
We get rid of parentheses
-90x+90=0
We move all terms containing x to the left, all other terms to the right
-90x=-90
x=-90/-90
x=1
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