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