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y in (-oo:+oo)
(1/2)*y-((1/10)*y) = 4/5-y // - 4/5-y
(1/2)*y-((1/10)*y)+y-(4/5) = 0
(1/2)*y+(-1/10)*y+y-4/5 = 0
7/5*y-4/5 = 0 // + 4/5
7/5*y = 4/5 // : 7/5
y = 4/5/7/5
y = 4/7
y = 4/7
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