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90-(6x+12)=78-6x
We move all terms to the left:
90-(6x+12)-(78-6x)=0
We add all the numbers together, and all the variables
-(6x+12)-(-6x+78)+90=0
We get rid of parentheses
-6x+6x-12-78+90=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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