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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
7*v^2-((70*v)/v)-10 = 0
7*v^2-70-10 = 0
7*v^2 = 80 // : 7
v^2 = 80/7
v^2 = 80/7 // ^ 1/2
abs(v) = (80/7)^(1/2)
v = (80/7)^(1/2) or v = -(80/7)^(1/2)
v in { (80/7)^(1/2), -(80/7)^(1/2) }
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