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90=7x+16x-2
We move all terms to the left:
90-(7x+16x-2)=0
We add all the numbers together, and all the variables
-(23x-2)+90=0
We get rid of parentheses
-23x+2+90=0
We add all the numbers together, and all the variables
-23x+92=0
We move all terms containing x to the left, all other terms to the right
-23x=-92
x=-92/-23
x=+4
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