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x in (-oo:+oo)
(1/3)*(3*c+15*d)-((1/2)*(8*c-(10*d))) = 0
(1/3)*(3*c+15*d)+(-1/2)*(8*c-10*d) = 0
1/3*(3*c+15*d)-1/2*(8*c-10*d) = 0
1/3*(3*c+15*d)-1/2*(8*c-10*d) = 0
10*d-3*c = 0
10*d-3*c = 0
x belongs to the empty set
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