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c in (-oo:+oo)
-10 = c/3+c/6-4 // - c/3+c/6-4
4-(c/3)-(c/6)-10 = 0
-1/2*c-6 = 0 // + 6
-1/2*c = 6 // : -1/2
c = 6/(-1/2)
c = -12
c = -12
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