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v in (-oo:+oo)
-4 = (v-12)/4 // - (v-12)/4
-((v-12)/4)-4 = 0
(-1*(v-12))/4-4 = 0
(-1*(v-12))/4+(-4*4)/4 = 0
-1*(v-12)-4*4 = 0
-v-4 = 0
(-v-4)/4 = 0
(-v-4)/4 = 0 // * 4
-v-4 = 0
-v-4 = 0 // + 4
-v = 4 // * -1
v = -4
v = -4
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