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x in (-oo:+oo)
L = (11*(D+d))/7+c*((D-d)/4)+2*C // - (11*(D+d))/7+c*((D-d)/4)+2*C
L-((11*(D+d))/7)-(c*((D-d)/4))-(2*C) = 0
(-11/7)*(D+d)-(c*((D-d)/4))-2*C+L = 0
(-1*c*(D-d))/4-11/7*(D+d)-2*C+L = 0
(-11/7*4*(D+d))/4+(-1*c*(D-d))/4+(-2*4*C)/4+(4*L)/4 = 0
4*L-11/7*4*(D+d)-1*c*(D-d)-2*4*C = 0
4*L-8*C-44/7*D-(D*c)-44/7*d+c*d = 0
(4*L-8*C-44/7*D-(D*c)-44/7*d+c*d)/4 = 0
(4*L-8*C-44/7*D-(D*c)-44/7*d+c*d)/4 = 0 // * 4
4*L-8*C-44/7*D-(D*c)-44/7*d+c*d = 0
x belongs to the empty set
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