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v in (-oo:+oo)
v/2 = 1.77 // - 1.77
v/2-1.77 = 0
1/2*v-1.77 = 0 // + 1.77
1/2*v = 1.77 // : 1/2
v = 1.77/1/2
v = 3.54
v = 3.54
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