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