-2(3b-1)=20

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Solution for -2(3b-1)=20 equation: 



-2(3b-1)=20

We move all terms to the left:

-2(3b-1)-(20)=0

We multiply parentheses

-6b+2-20=0

We add all the numbers together, and all the variables

-6b-18=0

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

-6b=18

b=18/-6

b=-3

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