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v in (-oo:+oo)
-1 = -v/4-6 // + -v/4-6
6-(-v/4)-1 = 0
(1/4)*v-1+6 = 0
1/4*v+5 = 0 // - 5
1/4*v = -5 // : 1/4
v = -5/1/4
v = -20
v = -20
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