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y in (-oo:+oo)
(y+3)/4 = -y-8 // + -y-8
(y+3)/4+y+8 = 0
(y+3)/4+(4*y)/4+(4*8)/4 = 0
y+4*y+4*8+3 = 0
5*y+3+32 = 0
5*y+35 = 0
(5*y+35)/4 = 0
(5*y+35)/4 = 0 // * 4
5*y+35 = 0
5*y+35 = 0 // - 35
5*y = -35 // : 5
y = -35/5
y = -7
y = -7
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