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3/8c=21
We move all terms to the left:
3/8c-(21)=0
Domain of the equation: 8c!=0We multiply all the terms by the denominator
c!=0/8
c!=0
c∈R
-21*8c+3=0
Wy multiply elements
-168c+3=0
We move all terms containing c to the left, all other terms to the right
-168c=-3
c=-3/-168
c=1/56
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