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3/5c=21
We move all terms to the left:
3/5c-(21)=0
Domain of the equation: 5c!=0We multiply all the terms by the denominator
c!=0/5
c!=0
c∈R
-21*5c+3=0
Wy multiply elements
-105c+3=0
We move all terms containing c to the left, all other terms to the right
-105c=-3
c=-3/-105
c=1/35
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