13=b/4+9

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Solution for 13=b/4+9 equation: 



13=b/4+9

We move all terms to the left:

13-(b/4+9)=0

We get rid of parentheses

-b/4-9+13=0

We multiply all the terms by the denominator


-b-9*4+13*4=0

We add all the numbers together, and all the variables

-1b+16=0

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

-b=-16

b=-16/-1

b=+16

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