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90=12x/3
We move all terms to the left:
90-(12x/3)=0
We add all the numbers together, and all the variables
-(+12x/3)+90=0
We get rid of parentheses
-12x/3+90=0
We multiply all the terms by the denominator
-12x+90*3=0
We add all the numbers together, and all the variables
-12x+270=0
We move all terms containing x to the left, all other terms to the right
-12x=-270
x=-270/-12
x=22+1/2
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