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