12=18-2b

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Solution for 12=18-2b equation: 



12=18-2b

We move all terms to the left:

12-(18-2b)=0

We add all the numbers together, and all the variables

-(-2b+18)+12=0

We get rid of parentheses

2b-18+12=0

We add all the numbers together, and all the variables

2b-6=0

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

2b=6

b=6/2

b=3

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