3b+9=10b-12

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Solution for 3b+9=10b-12 equation: 



3b+9=10b-12

We move all terms to the left:

3b+9-(10b-12)=0

We get rid of parentheses

3b-10b+12+9=0

We add all the numbers together, and all the variables

-7b+21=0

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

-7b=-21

b=-21/-7

b=+3

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