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3(1+5n)-3(1-3n)=48
We move all terms to the left:
3(1+5n)-3(1-3n)-(48)=0
We add all the numbers together, and all the variables
3(5n+1)-3(-3n+1)-48=0
We multiply parentheses
15n+9n+3-3-48=0
We add all the numbers together, and all the variables
24n-48=0
We move all terms containing n to the left, all other terms to the right
24n=48
n=48/24
n=2
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