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20/9b=20
We move all terms to the left:
20/9b-(20)=0
Domain of the equation: 9b!=0We multiply all the terms by the denominator
b!=0/9
b!=0
b∈R
-20*9b+20=0
Wy multiply elements
-180b+20=0
We move all terms containing b to the left, all other terms to the right
-180b=-20
b=-20/-180
b=1/9
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