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c in (-oo:+oo)
c/9 = 4/16 // - 4/16
c/9-(4/16) = 0
c/9-1/4 = 0
1/9*c-1/4 = 0 // + 1/4
1/9*c = 1/4 // : 1/9
c = 1/4/1/9
c = 9/4
c = 9/4
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