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y in (-oo:+oo)
5/10 = 2*10*y // - 2*10*y
5/10-(2*10*y) = 0
5/10-20*y = 0
1/2-20*y = 0 // - 1/2
-20*y = -1/2 // : -20
y = -1/2/(-20)
y = 1/40
y = 1/40
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