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y in (-oo:+oo)
550-((30*y)/50) = 0
(-3/5)*y+550 = 0
550-3/5*y = 0 // - 550
-3/5*y = -550 // : -3/5
y = -550/(-3/5)
y = 2750/3
y = 2750/3
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