7b+4-9b+2=20

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Solution for 7b+4-9b+2=20 equation: 



7b+4-9b+2=20

We move all terms to the left:

7b+4-9b+2-(20)=0

We add all the numbers together, and all the variables

-2b-14=0

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

-2b=14

b=14/-2

b=-7

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