120+20b=180

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Solution for 120+20b=180 equation: 



120+20b=180

We move all terms to the left:

120+20b-(180)=0

We add all the numbers together, and all the variables

20b-60=0

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

20b=60

b=60/20

b=3

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