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2/7c=20
We move all terms to the left:
2/7c-(20)=0
Domain of the equation: 7c!=0We multiply all the terms by the denominator
c!=0/7
c!=0
c∈R
-20*7c+2=0
Wy multiply elements
-140c+2=0
We move all terms containing c to the left, all other terms to the right
-140c=-2
c=-2/-140
c=1/70
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