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y in (-oo:+oo)
(y+3)/4 = -y/8 // + -y/8
(y+3)/4-(-y/8) = 0
(y+3)/4+(1/8)*y = 0
(y+3)/4+y/8 = 0
(8*(y+3))/(4*8)+(4*y)/(4*8) = 0
8*(y+3)+4*y = 0
12*y+24 = 0
(12*y+24)/(4*8) = 0
(12*y+24)/(4*8) = 0 // * 4*8
12*y+24 = 0
12*y+24 = 0 // - 24
12*y = -24 // : 12
y = -24/12
y = -2
y = -2
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