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7n+3(5n+4)=16
We move all terms to the left:
7n+3(5n+4)-(16)=0
We multiply parentheses
7n+15n+12-16=0
We add all the numbers together, and all the variables
22n-4=0
We move all terms containing n to the left, all other terms to the right
22n=4
n=4/22
n=2/11
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