-b+4b=80-b

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Solution for -b+4b=80-b equation: 



-b+4b=80-b

We move all terms to the left:

-b+4b-(80-b)=0

We add all the numbers together, and all the variables

-b+4b-(-1b+80)=0

We add all the numbers together, and all the variables

3b-(-1b+80)=0

We get rid of parentheses

3b+1b-80=0

We add all the numbers together, and all the variables

4b-80=0

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

4b=80

b=80/4

b=20

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