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c in (-oo:+oo)
20 = (5/10)*c // - (5/10)*c
20-((5/10)*c) = 0
(-1/2)*c+20 = 0
20-1/2*c = 0 // - 20
-1/2*c = -20 // : -1/2
c = -20/(-1/2)
c = 40
c = 40
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