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c in (-oo:+oo)
(1/2)*c+7/4 = (5/4)*c-(1/2) // - (5/4)*c-(1/2)
(1/2)*c-((5/4)*c)+7/4+1/2 = 0
(1/2)*c+(-5/4)*c+7/4+1/2 = 0
9/4-3/4*c = 0 // - 9/4
-3/4*c = -9/4 // : -3/4
c = -9/4/(-3/4)
c = 3
c = 3
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