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v in (-oo:+oo)
-8 = v/3-5 // - v/3-5
5-(v/3)-8 = 0
-1/3*v-3 = 0 // + 3
-1/3*v = 3 // : -1/3
v = 3/(-1/3)
v = -9
v = -9
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