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y in (-oo:+oo)
4 = (2/5)*(4*y-2) // - (2/5)*(4*y-2)
4-((2/5)*(4*y-2)) = 0
(-2/5)*(4*y-2)+4 = 0
4-2/5*(4*y-2) = 0
4-2/5*(4*y-2) = 0
24/5-8/5*y = 0
24/5-8/5*y = 0
24/5-8/5*y = 0 // - 24/5
-8/5*y = -24/5 // : -8/5
y = -24/5/(-8/5)
y = 3
y = 3
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