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90=x+39(2x)
We move all terms to the left:
90-(x+39(2x))=0
We add all the numbers together, and all the variables
-(+393x)+90=0
We get rid of parentheses
-393x+90=0
We move all terms containing x to the left, all other terms to the right
-393x=-90
x=-90/-393
x=30/131
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