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90=3x+1+2x+4
We move all terms to the left:
90-(3x+1+2x+4)=0
We add all the numbers together, and all the variables
-(5x+5)+90=0
We get rid of parentheses
-5x-5+90=0
We add all the numbers together, and all the variables
-5x+85=0
We move all terms containing x to the left, all other terms to the right
-5x=-85
x=-85/-5
x=+17
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