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v in (-oo:+oo)
-13 = v/5-3 // - v/5-3
3-(v/5)-13 = 0
-1/5*v-10 = 0 // + 10
-1/5*v = 10 // : -1/5
v = 10/(-1/5)
v = -50
v = -50
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