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c in (-oo:+oo)
5-(c/3) = 7/4 // - 7/4
5-(c/3)-(7/4) = 0
5-(c/3)-7/4 = 0
13/4-1/3*c = 0 // - 13/4
-1/3*c = -13/4 // : -1/3
c = -13/4/(-1/3)
c = 39/4
c = 39/4
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