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c in (-oo:+oo)
(4/5)*((1/4)*c-5) = 0
4/5*(1/4*c-5) = 0
1/4*c-5 = 0 // + 5
1/4*c = 5 // : 1/4
c = 5/1/4
c = 20
c = 20
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