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v in (-oo:+oo)
2.3 = v/1.2 // - v/1.2
2.3-(v/1.2) = 0
2.3-0.83333333*v = 0
2.3-0.83333333*v = 0 // - 2.3
-0.83333333*v = -2.3 // : -0.83333333
v = -2.3/(-0.83333333)
v = 2.76000001
v = 2.76000001
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