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