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c in (-oo:+oo)
-21 = (1/2)*c-11 // - (1/2)*c-11
11-((1/2)*c)-21 = 0
(-1/2)*c-21+11 = 0
-1/2*c-10 = 0 // + 10
-1/2*c = 10 // : -1/2
c = 10/(-1/2)
c = -20
c = -20
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