13b-13b+b-b+3b=12

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Solution for 13b-13b+b-b+3b=12 equation: 



13b-13b+b-b+3b=12

We move all terms to the left:

13b-13b+b-b+3b-(12)=0

We add all the numbers together, and all the variables

3b-12=0

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

3b=12

b=12/3

b=4

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