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y in (-oo:+oo)
(1/4)*y = (2/5)*y-1 // - (2/5)*y-1
(1/4)*y-((2/5)*y)+1 = 0
(1/4)*y+(-2/5)*y+1 = 0
1-3/20*y = 0 // - 1
-3/20*y = -1 // : -3/20
y = -1/(-3/20)
y = 20/3
y = 20/3
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