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y in (-oo:+oo)
(7*(4-y))/4 = -y // + y
(7*(4-y))/4+y = 0
(7*(4-y))/4+(4*y)/4 = 0
7*(4-y)+4*y = 0
28-3*y = 0
(28-3*y)/4 = 0
(28-3*y)/4 = 0 // * 4
28-3*y = 0
28-3*y = 0 // - 28
-3*y = -28 // : -3
y = -28/(-3)
y = 28/3
y = 28/3
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