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90=35x+5x
We move all terms to the left:
90-(35x+5x)=0
We add all the numbers together, and all the variables
-(+40x)+90=0
We get rid of parentheses
-40x+90=0
We move all terms containing x to the left, all other terms to the right
-40x=-90
x=-90/-40
x=2+1/4
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