b+21+119+b+20=180

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Solution for b+21+119+b+20=180 equation: 



b+21+119+b+20=180

We move all terms to the left:

b+21+119+b+20-(180)=0

We add all the numbers together, and all the variables

2b-20=0

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

2b=20

b=20/2

b=10

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