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