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y in (-oo:+oo)
(7*(4-y))/5 = -y // + y
(7*(4-y))/5+y = 0
(7*(4-y))/5+(5*y)/5 = 0
7*(4-y)+5*y = 0
28-2*y = 0
(28-2*y)/5 = 0
(28-2*y)/5 = 0 // * 5
28-2*y = 0
28-2*y = 0 // - 28
-2*y = -28 // : -2
y = -28/(-2)
y = 14
y = 14
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