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y in (-oo:+oo)
-30*(1/15) = 15*(1/15)*y // - 15*(1/15)*y
-(15*(1/15)*y)-30*(1/15) = 0
-y-30*(1/15) = 0
-y-2 = 0 // + 2
-y = 2 // * -1
y = -2
y = -2
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