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4=2+q
We move all terms to the left:
4-(2+q)=0
We add all the numbers together, and all the variables
-(q+2)+4=0
We get rid of parentheses
-q-2+4=0
We add all the numbers together, and all the variables
-1q+2=0
We move all terms containing q to the left, all other terms to the right
-q=-2
q=-2/-1
q=+2
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