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v in (-oo:+oo)
-4*6.4 = v/(-5.3) // - v/(-5.3)
-(v/(-5.3))-4*6.4 = 0
0.18867925*v-4*6.4 = 0
0.18867925*v-25.6 = 0 // + 25.6
0.18867925*v = 25.6 // : 0.18867925
v = 25.6/0.18867925
v = 135.67999661
v = 135.67999661
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