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c in (-oo:+oo)
(3/4)*c-c+4+12 = 8 // - 8
(3/4)*c-c-8+4+12 = 0
8-1/4*c = 0 // - 8
-1/4*c = -8 // : -1/4
c = -8/(-1/4)
c = 32
c = 32
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