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y in (-oo:+oo)
25/2 = 5*y // - 5*y
25/2-(5*y) = 0
25/2-5*y = 0
25/2-5*y = 0 // - 25/2
-5*y = -25/2 // : -5
y = -25/2/(-5)
y = 5/2
y = 5/2
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