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105n=4200+35n
We move all terms to the left:
105n-(4200+35n)=0
We add all the numbers together, and all the variables
105n-(35n+4200)=0
We get rid of parentheses
105n-35n-4200=0
We add all the numbers together, and all the variables
70n-4200=0
We move all terms containing n to the left, all other terms to the right
70n=4200
n=4200/70
n=60
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