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c in (-oo:+oo)
(2/3)*(6*c-18)+(3/4)*(8*c+33) = -18 // + 18
(2/3)*(6*c-18)+(3/4)*(8*c+33)+18 = 0
2/3*(6*c-18)+3/4*(8*c+33)+18 = 0
2/3*(6*c-18)+3/4*(8*c+33)+18 = 0
10*c+51/4+18 = 0
10*c+123/4 = 0
10*c+123/4 = 0
10*c+123/4 = 0 // - 123/4
10*c = -123/4 // : 10
c = -123/4/10
c = -123/40
c = -123/40
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