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v in (-oo:+oo)
-1.41 = v/(-2.1) // - v/(-2.1)
-(v/(-2.1))-1.41 = 0
0.47619048*v-1.41 = 0
0.47619048*v-1.41 = 0 // + 1.41
0.47619048*v = 1.41 // : 0.47619048
v = 1.41/0.47619048
v = 2.96099998
v = 2.96099998
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