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v in (-oo:+oo)
4/8 = v/10 // - v/10
4/8-(v/10) = 0
1/2-1/10*v = 0 // - 1/2
-1/10*v = -1/2 // : -1/10
v = -1/2/(-1/10)
v = 5
v = 5
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