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