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v in (-oo:+oo)
12/2+4 = -5*v // + -5*v
12/2-(-5*v)+4 = 0
5*v+12/2+4 = 0
5*v+10 = 0 // - 10
5*v = -10 // : 5
v = -10/5
v = -2
v = -2
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