3-5b-4=-21

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Solution for 3-5b-4=-21 equation: 



3-5b-4=-21

We move all terms to the left:

3-5b-4-(-21)=0

We add all the numbers together, and all the variables

-5b+20=0

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

-5b=-20

b=-20/-5

b=+4

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