4b-12=9b+3

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Solution for 4b-12=9b+3 equation: 



4b-12=9b+3

We move all terms to the left:

4b-12-(9b+3)=0

We get rid of parentheses

4b-9b-3-12=0

We add all the numbers together, and all the variables

-5b-15=0

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

-5b=15

b=15/-5

b=-3

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