We know that if XY = 0 then there are two options: X = 0 or Y = 0
Then, in this case:
If ( 1 - v ) (5v +9 ) = 0 then
( 1 - v ) = 0 or (5v +9) = 0
We find v for both cases:
1 - v₁ = 0
1 = v₁
5v₂ + 9 = 0
5v₂ = -9
v₂ = -9/5
