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n/4-12=-9
We move all terms to the left:
n/4-12-(-9)=0
We add all the numbers together, and all the variables
n/4-3=0
We multiply all the terms by the denominator
n-3*4=0
We add all the numbers together, and all the variables
n-12=0
We move all terms containing n to the left, all other terms to the right
n=12
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