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