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6(n-7)-3(4-n)=0
We add all the numbers together, and all the variables
6(n-7)-3(-1n+4)=0
We multiply parentheses
6n+3n-42-12=0
We add all the numbers together, and all the variables
9n-54=0
We move all terms containing n to the left, all other terms to the right
9n=54
n=54/9
n=6
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