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c in (-oo:+oo)
4/3 = -6*c-(5/3) // + -6*c-(5/3)
4/3-(-6*c)+5/3 = 0
6*c+4/3+5/3 = 0
6*c+3 = 0 // - 3
6*c = -3 // : 6
c = -3/6
c = -1/2
c = -1/2
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