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