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4/b=12
We move all terms to the left:
4/b-(12)=0
Domain of the equation: b!=0We multiply all the terms by the denominator
b∈R
-12*b+4=0
We add all the numbers together, and all the variables
-12b+4=0
We move all terms containing b to the left, all other terms to the right
-12b=-4
b=-4/-12
b=1/3
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