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v in (-oo:+oo)
7 = v/22.4 // - v/22.4
7-(v/22.4) = 0
7-0.04464286*v = 0
7-0.04464286*v = 0 // - 7
-0.04464286*v = -7 // : -0.04464286
v = -7/(-0.04464286)
v = 156.79998996
v = 156.79998996
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