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y in (-oo:+oo)
(15*y)/300 = 4140 // - 4140
(15*y)/300-4140 = 0
1/20*y-4140 = 0 // + 4140
1/20*y = 4140 // : 1/20
y = 4140/1/20
y = 82800
y = 82800
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