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c in (-oo:+oo)
1/2 = (1/2)*c-2 // - (1/2)*c-2
1/2-((1/2)*c)+2 = 0
(-1/2)*c+1/2+2 = 0
5/2-1/2*c = 0 // - 5/2
-1/2*c = -5/2 // : -1/2
c = -5/2/(-1/2)
c = 5
c = 5
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