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v in (-oo:+oo)
-12.5 = v/5 // - v/5
-(v/5)-12.5 = 0
-1/5*v-12.5 = 0 // + 12.5
-1/5*v = 12.5 // : -1/5
v = 12.5/(-1/5)
v = -62.5
v = -62.5
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