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y in (-oo:+oo)
(4*y-8)/2 = 2*y-4 // - 2*y-4
(4*y-8)/2-(2*y)+4 = 0
(4*y-8)/2-2*y+4 = 0
(4*y-8)/2+(-2*2*y)/2+(2*4)/2 = 0
4*y-2*2*y+2*4-8 = 0
8-8 = 0
0 = 0
0/2 = 0
0/2 = 0 // * 2
0 = 0
0 = 0
y należy do R
y in (-oo:+oo)
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