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v in (-oo:+oo)
12.9 = 3.2-(v/1.8) // - 3.2-(v/1.8)
v/1.8-3.2+12.9 = 0
0.55555556*v+9.7 = 0 // - 9.7
0.55555556*v = -9.7 // : 0.55555556
v = -9.7/0.55555556
v = -17.45999986
v = -17.45999986
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