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-39-(-42)=x/4
We move all terms to the left:
-39-(-42)-(x/4)=0
We add all the numbers together, and all the variables
-(+x/4)-39-(-42)=0
We add all the numbers together, and all the variables
-(+x/4)+3=0
We get rid of parentheses
-x/4+3=0
We multiply all the terms by the denominator
-x+3*4=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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