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z in (-oo:+oo)
3 = (z+8)/4 // - (z+8)/4
3-((z+8)/4) = 0
(-1*(z+8))/4+3 = 0
(-1*(z+8))/4+(3*4)/4 = 0
3*4-1*(z+8) = 0
4-z = 0
(4-z)/4 = 0
(4-z)/4 = 0 // * 4
4-z = 0
4-z = 0 // - 4
-z = -4 // * -1
z = 4
z = 4
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