40+30n=220

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Solution for 40+30n=220 equation: 



40+30n=220

We move all terms to the left:

40+30n-(220)=0

We add all the numbers together, and all the variables

30n-180=0

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

30n=180

n=180/30

n=6

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