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1/13b=90
We move all terms to the left:
1/13b-(90)=0
Domain of the equation: 13b!=0We multiply all the terms by the denominator
b!=0/13
b!=0
b∈R
-90*13b+1=0
Wy multiply elements
-1170b+1=0
We move all terms containing b to the left, all other terms to the right
-1170b=-1
b=-1/-1170
b=1/1170
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