4b-20=15-b

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Solution for 4b-20=15-b equation: 



4b-20=15-b

We move all terms to the left:

4b-20-(15-b)=0

We add all the numbers together, and all the variables

4b-(-1b+15)-20=0

We get rid of parentheses

4b+1b-15-20=0

We add all the numbers together, and all the variables

5b-35=0

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

5b=35

b=35/5

b=7

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