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v in (-oo:+oo)
-23 = v/4+5 // - v/4+5
-(v/4)-23-5 = 0
-1/4*v-28 = 0 // + 28
-1/4*v = 28 // : -1/4
v = 28/(-1/4)
v = -112
v = -112
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