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4/9c=20
We move all terms to the left:
4/9c-(20)=0
Domain of the equation: 9c!=0We multiply all the terms by the denominator
c!=0/9
c!=0
c∈R
-20*9c+4=0
Wy multiply elements
-180c+4=0
We move all terms containing c to the left, all other terms to the right
-180c=-4
c=-4/-180
c=1/45
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