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v in (-oo:+oo)
-8.6 = v/4-2.2 // - v/4-2.2
2.2-(v/4)-8.6 = 0
-1/4*v-6.4 = 0 // + 6.4
-1/4*v = 6.4 // : -1/4
v = 6.4/(-1/4)
v = -25.6
v = -25.6
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