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42-(21x+12x)=44
We move all terms to the left:
42-(21x+12x)-(44)=0
We add all the numbers together, and all the variables
-(+33x)+42-44=0
We add all the numbers together, and all the variables
-(+33x)-2=0
We get rid of parentheses
-33x-2=0
We move all terms containing x to the left, all other terms to the right
-33x=2
x=2/-33
x=-2/33
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