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x in (-oo:+oo)
-(c*((8*c+4*d)/8))-(c*((8*c-(11*d))/8)) = 0
-(c*((8*c+4*d)/8))-(c*((8*c-11*d)/8)) = 0
(-1*c*(8*c+4*d))/8+(-1*c*(8*c-11*d))/8 = 0
-1*c*(8*c+4*d)-1*c*(8*c-11*d) = 0
7*c*d-16*c^2 = 0
(7*c*d-16*c^2)/8 = 0
(7*c*d-16*c^2)/8 = 0 // * 8
7*c*d-16*c^2 = 0
x belongs to the empty set
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