12=4(2)+b

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Solution for 12=4(2)+b equation: 



12=4(2)+b

We move all terms to the left:

12-(4(2)+b)=0

We add all the numbers together, and all the variables

-(b+42)+12=0

We get rid of parentheses

-b-42+12=0

We add all the numbers together, and all the variables

-1b-30=0

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

-b=30

b=30/-1

b=-30

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