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v in (-oo:+oo)
3*v = -15/2 // + -15/2
3*v-(-15/2) = 0
3*v+15/2 = 0
3*v+15/2 = 0 // - 15/2
3*v = -15/2 // : 3
v = -15/2/3
v = -5/2
v = -5/2
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