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y in (-oo:+oo)
y = 250*(1/9)^1-3 // - 250*(1/9)^1-3
y-(250*(1/9)^1)+3 = 0
y-250/9+3 = 0
y-223/9 = 0 // + 223/9
y = 223/9
y = 223/9
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