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c in (-oo:+oo)
(3/5)*(c-(1/2)) = c+9/10 // - c+9/10
(3/5)*(c-(1/2))-c-(9/10) = 0
(3/5)*(c-1/2)-c-9/10 = 0
3/5*(c-1/2)-c-9/10 = 0
(3/5*10*(c-1/2))/10+(10*(-c))/10-9/10 = 0
3/5*10*(c-1/2)+10*(-c)-9 = 0
-4*c-9-3 = 0
-4*c-12 = 0
(-4*c-12)/10 = 0
(-4*c-12)/10 = 0 // * 10
-4*c-12 = 0
-4*c-12 = 0 // + 12
-4*c = 12 // : -4
c = 12/(-4)
c = -3
c = -3
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