4b+20-9=-7

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



4b+20-9=-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

4b+18=0

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

4b=-18

b=-18/4

b=-4+1/2

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