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y in (-oo:+oo)
(16*y)/100 = 72000 // - 72000
(16*y)/100-72000 = 0
4/25*y-72000 = 0 // + 72000
4/25*y = 72000 // : 4/25
y = 72000/4/25
y = 450000
y = 450000
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