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c in (-oo:+oo)
52 = (4/8)*c // - (4/8)*c
52-((4/8)*c) = 0
(-1/2)*c+52 = 0
52-1/2*c = 0 // - 52
-1/2*c = -52 // : -1/2
c = -52/(-1/2)
c = 104
c = 104
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