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c in (-oo:+oo)
8*c-2 = (2/3)*c-12 // - (2/3)*c-12
8*c-((2/3)*c)-2+12 = 0
8*c+(-2/3)*c-2+12 = 0
22/3*c+10 = 0 // - 10
22/3*c = -10 // : 22/3
c = -10/22/3
c = -15/11
c = -15/11
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