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y in (-oo:+oo)
(2/5)*(-25*y-(8/5))+(1/5)*y = -1 // + 1
(2/5)*(-25*y-(8/5))+(1/5)*y+1 = 0
(2/5)*(-25*y-8/5)+(1/5)*y+1 = 0
2/5*(-25*y-8/5)+y/5+1 = 0
(2/5*5*(-25*y-8/5))/5+y/5+(1*5)/5 = 0
2/5*5*(-25*y-8/5)+y+1*5 = 0
5-49*y-16/5 = 0
9/5-49*y = 0
(9/5-49*y)/5 = 0
(9/5-49*y)/5 = 0 // * 5
9/5-49*y = 0
9/5-49*y = 0 // - 9/5
-49*y = -9/5 // : -49
y = -9/5/(-49)
y = 9/245
y = 9/245
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