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