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X in (-oo:+oo)
(12-X)/4 = 5 // - 5
(12-X)/4-5 = 0
(12-X)/4+(-5*4)/4 = 0
12-X-5*4 = 0
-X-8 = 0
(-X-8)/4 = 0
(-X-8)/4 = 0 // * 4
-X-8 = 0
-X-8 = 0 // + 8
-X = 8 // * -1
X = -8
X = -8
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