4b+9=-75

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Solution for 4b+9=-75 equation: 



4b+9=-75

We move all terms to the left:

4b+9-(-75)=0

We add all the numbers together, and all the variables

4b+84=0

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

4b=-84

b=-84/4

b=-21

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