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c in (-oo:+oo)
(-1/2)*c+1 = 6 // - 6
(-1/2)*c-6+1 = 0
-1/2*c-5 = 0 // + 5
-1/2*c = 5 // : -1/2
c = 5/(-1/2)
c = -10
c = -10
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