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c in (-oo:+oo)
9-((1/4)*c) = 3/8 // - 3/8
9-((1/4)*c)-(3/8) = 0
(-1/4)*c-3/8+9 = 0
69/8-1/4*c = 0 // - 69/8
-1/4*c = -69/8 // : -1/4
c = -69/8/(-1/4)
c = 69/2
c = 69/2
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