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v in (-oo:+oo)
v/17.5 = 7 // - 7
v/17.5-7 = 0
0.05714286*v-7 = 0 // + 7
0.05714286*v = 7 // : 0.05714286
v = 7/0.05714286
v = 122.49999388
v = 122.49999388
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