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7n/9=4
We move all terms to the left:
7n/9-(4)=0
We multiply all the terms by the denominator
7n-4*9=0
We add all the numbers together, and all the variables
7n-36=0
We move all terms containing n to the left, all other terms to the right
7n=36
n=36/7
n=5+1/7
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