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c in (-oo:+oo)
(2/3)*(6*c-18)+(3/4)*(8*c+32) = -18 // + 18
(2/3)*(6*c-18)+(3/4)*(8*c+32)+18 = 0
2/3*(6*c-18)+3/4*(8*c+32)+18 = 0
2/3*(6*c-18)+3/4*(8*c+32)+18 = 0
10*c+12+18 = 0
10*c+30 = 0
10*c+30 = 0
10*c+30 = 0 // - 30
10*c = -30 // : 10
c = -30/10
c = -3
c = -3
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