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v in (-oo:+oo)
-13 = v/5+7 // - v/5+7
-(v/5)-13-7 = 0
-1/5*v-20 = 0 // + 20
-1/5*v = 20 // : -1/5
v = 20/(-1/5)
v = -100
v = -100
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