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v in (-oo:+oo)
7 = v/11.2 // - v/11.2
7-(v/11.2) = 0
7-0.08928571*v = 0
7-0.08928571*v = 0 // - 7
-0.08928571*v = -7 // : -0.08928571
v = -7/(-0.08928571)
v = 78.40000376
v = 78.40000376
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