0.5n+3n=120

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Solution for 0.5n+3n=120 equation: 



0.5n+3n=120

We move all terms to the left:

0.5n+3n-(120)=0

We add all the numbers together, and all the variables

3.5n-120=0

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

3.5n=120

n=120/3.5

n=34+1/3.5

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