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c in (-oo:+oo)
20 = (1/4)*c // - (1/4)*c
20-((1/4)*c) = 0
(-1/4)*c+20 = 0
20-1/4*c = 0 // - 20
-1/4*c = -20 // : -1/4
c = -20/(-1/4)
c = 80
c = 80
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