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