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c in (-oo:+oo)
(1/4)*(12-(8*c)) = -10 // + 10
(1/4)*(12-(8*c))+10 = 0
(1/4)*(12-8*c)+10 = 0
1/4*(12-8*c)+10 = 0
1/4*(12-8*c)+10 = 0
13-2*c = 0
13-2*c = 0
13-2*c = 0 // - 13
-2*c = -13 // : -2
c = -13/(-2)
c = 13/2
c = 13/2
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