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90=x+5+3x-7
We move all terms to the left:
90-(x+5+3x-7)=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+92=0
We move all terms containing x to the left, all other terms to the right
-4x=-92
x=-92/-4
x=+23
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