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