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y in (-oo:+oo)
-5/2 = y/9 // - y/9
-(y/9)-5/2 = 0
-1/9*y-5/2 = 0 // + 5/2
-1/9*y = 5/2 // : -1/9
y = 5/2/(-1/9)
y = -45/2
y = -45/2
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