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v in (-oo:+oo)
-12 = v/5+7 // - v/5+7
-(v/5)-12-7 = 0
-1/5*v-19 = 0 // + 19
-1/5*v = 19 // : -1/5
v = 19/(-1/5)
v = -95
v = -95
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