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7(1+5n)+6(1+4n=13)
We move all terms to the left:
7(1+5n)+6(1+4n-(13))=0
We add all the numbers together, and all the variables
7(5n+1)+6(4n-12)=0
We multiply parentheses
35n+24n+7-72=0
We add all the numbers together, and all the variables
59n-65=0
We move all terms containing n to the left, all other terms to the right
59n=65
n=65/59
n=1+6/59
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