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y in (-oo:+oo)
(15*y)/25-(18/20) = (27*y)/30-(300/50) // - (27*y)/30-(300/50)
(15*y)/25-((27*y)/30)-(18/20)+300/50 = 0
(15*y)/25+(-9/10)*y-9/10+300/50 = 0
51/10-3/10*y = 0 // - 51/10
-3/10*y = -51/10 // : -3/10
y = -51/10/(-3/10)
y = 17
y = 17
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