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n/7-4=45
We move all terms to the left:
n/7-4-(45)=0
We add all the numbers together, and all the variables
n/7-49=0
We multiply all the terms by the denominator
n-49*7=0
We add all the numbers together, and all the variables
n-343=0
We move all terms containing n to the left, all other terms to the right
n=343
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