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v in (-oo:+oo)
1 = v/2-1.7 // - v/2-1.7
1-(v/2)+1.7 = 0
2.7-1/2*v = 0 // - 2.7
-1/2*v = -2.7 // : -1/2
v = -2.7/(-1/2)
v = 5.4
v = 5.4
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