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v in (-oo:+oo)
(-3*v)/5 = 9/10 // - 9/10
(-3*v)/5-(9/10) = 0
(-3*v)/5-9/10 = 0
-3/5*v-9/10 = 0 // + 9/10
-3/5*v = 9/10 // : -3/5
v = 9/10/(-3/5)
v = -3/2
v = -3/2
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