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y in (-oo:+oo)
1/2-((16/25)*y) = 12/25-((1/10)*y) // - 12/25-((1/10)*y)
(1/10)*y-((16/25)*y)+1/2-(12/25) = 0
(-16/25)*y+(1/10)*y+1/2-12/25 = 0
1/50-27/50*y = 0 // - 1/50
-27/50*y = -1/50 // : -27/50
y = -1/50/(-27/50)
y = 1/27
y = 1/27
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