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v in (-oo:+oo)
-v/2 = 7.5 // - 7.5
-v/2-7.5 = 0
-1/2*v-7.5 = 0 // + 7.5
-1/2*v = 7.5 // : -1/2
v = 7.5/(-1/2)
v = -15
v = -15
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