9=4b+13

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Solution for 9=4b+13 equation: 



9=4b+13

We move all terms to the left:

9-(4b+13)=0

We get rid of parentheses

-4b-13+9=0

We add all the numbers together, and all the variables

-4b-4=0

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

-4b=4

b=4/-4

b=-1

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