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c in (-oo:+oo)
(8/3)*c-2 = (2/3)*c-12 // - (2/3)*c-12
(8/3)*c-((2/3)*c)-2+12 = 0
(8/3)*c+(-2/3)*c-2+12 = 0
2*c+10 = 0 // - 10
2*c = -10 // : 2
c = -10/2
c = -5
c = -5
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