3(2-4b)=90

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Solution for 3(2-4b)=90 equation: 



3(2-4b)=90

We move all terms to the left:

3(2-4b)-(90)=0

We add all the numbers together, and all the variables

3(-4b+2)-90=0

We multiply parentheses

-12b+6-90=0

We add all the numbers together, and all the variables

-12b-84=0

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

-12b=84

b=84/-12

b=-7

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