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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-18+12 = 0
10*c-6 = 0
10*c-6 = 0
10*c-6 = 0 // + 6
10*c = 6 // : 10
c = 6/10
c = 3/5
c = 3/5
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