3b-4b=20

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Solution for 3b-4b=20 equation: 



3b-4b=20

We move all terms to the left:

3b-4b-(20)=0

We add all the numbers together, and all the variables

-1b-20=0

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

-b=20

b=20/-1

b=-20

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