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90=3x+2+x
We move all terms to the left:
90-(3x+2+x)=0
We add all the numbers together, and all the variables
-(4x+2)+90=0
We get rid of parentheses
-4x-2+90=0
We add all the numbers together, and all the variables
-4x+88=0
We move all terms containing x to the left, all other terms to the right
-4x=-88
x=-88/-4
x=+22
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