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4/5b-9=0
Domain of the equation: 5b!=0We multiply all the terms by the denominator
b!=0/5
b!=0
b∈R
-9*5b+4=0
Wy multiply elements
-45b+4=0
We move all terms containing b to the left, all other terms to the right
-45b=-4
b=-4/-45
b=4/45
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