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c in (-oo:+oo)
(8/7)*c-2 = (2/3)*c-12 // - (2/3)*c-12
(8/7)*c-((2/3)*c)-2+12 = 0
(8/7)*c+(-2/3)*c-2+12 = 0
10/21*c+10 = 0 // - 10
10/21*c = -10 // : 10/21
c = -10/10/21
c = -21
c = -21
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