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v in (-oo:+oo)
(-1/2)*v = -9/10 // + -9/10
(-1/2)*v-(-9/10) = 0
(-1/2)*v+9/10 = 0
9/10-1/2*v = 0 // - 9/10
-1/2*v = -9/10 // : -1/2
v = -9/10/(-1/2)
v = 9/5
v = 9/5
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