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y in (-oo:+oo)
-(5*y)-1/2 = 4 // - 4
-(5*y)-1/2-4 = 0
-5*y-1/2-4 = 0
-5*y-9/2 = 0 // + 9/2
-5*y = 9/2 // : -5
y = 9/2/(-5)
y = -9/10
y = -9/10
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