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y in (-oo:+oo)
(7/5)*(y+1) = (8/5)*y // - (8/5)*y
(7/5)*(y+1)-((8/5)*y) = 0
(7/5)*(y+1)+(-8/5)*y = 0
7/5*(y+1)+(-8*y)/5 = 0
(7/5*5*(y+1))/5+(-8*y)/5 = 0
7/5*5*(y+1)-8*y = 0
7-y = 0
(7-y)/5 = 0
(7-y)/5 = 0 // * 5
7-y = 0
7-y = 0 // - 7
-y = -7 // * -1
y = 7
y = 7
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