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c in (-oo:+oo)
(7/4)*c-(5/4) = 0
(7/4)*c-5/4 = 0
7/4*c-5/4 = 0 // + 5/4
7/4*c = 5/4 // : 7/4
c = 5/4/7/4
c = 5/7
c = 5/7
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