12+b=12-3

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Solution for 12+b=12-3 equation: 



12+b=12-3

We move all terms to the left:

12+b-(12-3)=0

We add all the numbers together, and all the variables

b+12-9=0

We add all the numbers together, and all the variables

b+3=0

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

b=-3

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