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v in (-oo:+oo)
-0.338709677419 = v/12.4 // - v/12.4
-(v/12.4)-0.338709677419 = 0
-0.08064516*v-0.338709677419 = 0
-0.08064516*v-0.338709677419 = 0 // + 0.338709677419
-0.08064516*v = 0.338709677419 // : -0.08064516
v = 0.338709677419/(-0.08064516)
v = -4.20000007
v = -4.20000007
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