-2b+5-7b=23

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Solution for -2b+5-7b=23 equation: 



-2b+5-7b=23

We move all terms to the left:

-2b+5-7b-(23)=0

We add all the numbers together, and all the variables

-9b-18=0

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

-9b=18

b=18/-9

b=-2

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