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10n/12-9-7n+4n=31
We move all terms to the left:
10n/12-9-7n+4n-(31)=0
We add all the numbers together, and all the variables
-3n+10n/12-40=0
We multiply all the terms by the denominator
-3n*12+10n-40*12=0
We add all the numbers together, and all the variables
10n-3n*12-480=0
Wy multiply elements
10n-36n-480=0
We add all the numbers together, and all the variables
-26n-480=0
We move all terms containing n to the left, all other terms to the right
-26n=480
n=480/-26
n=-18+6/13
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