(b-10)+(b+20)=180

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Solution for (b-10)+(b+20)=180 equation: 



(b-10)+(b+20)=180

We move all terms to the left:

(b-10)+(b+20)-(180)=0

We get rid of parentheses

b+b-10+20-180=0

We add all the numbers together, and all the variables

2b-170=0

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

2b=170

b=170/2

b=85

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