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4=n/9+3
We move all terms to the left:
4-(n/9+3)=0
We get rid of parentheses
-n/9-3+4=0
We multiply all the terms by the denominator
-n-3*9+4*9=0
We add all the numbers together, and all the variables
-1n+9=0
We move all terms containing n to the left, all other terms to the right
-n=-9
n=-9/-1
n=+9
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