5*n+10*n+20*n=120

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Solution for 5*n+10*n+20*n=120 equation: 



5n+10n+20n=120

We move all terms to the left:

5n+10n+20n-(120)=0

We add all the numbers together, and all the variables

35n-120=0

We move all terms containing n to the left, all other terms to the right

35n=120

n=120/35

n=3+3/7

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