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v in (-oo:+oo)
-0.25 = v/20 // - v/20
-(v/20)-0.25 = 0
-1/20*v-0.25 = 0 // + 0.25
-1/20*v = 0.25 // : -1/20
v = 0.25/(-1/20)
v = -5
v = -5
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