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y in (-oo:+oo)
(16-y)/4 = 6 // - 6
(16-y)/4-6 = 0
(16-y)/4+(-6*4)/4 = 0
16-y-6*4 = 0
-y-8 = 0
(-y-8)/4 = 0
(-y-8)/4 = 0 // * 4
-y-8 = 0
-y-8 = 0 // + 8
-y = 8 // * -1
y = -8
y = -8
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