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v in (-oo:+oo)
(7*v+1/5)*(1/19-(8*v)) = 0
(7*v+1/5)*(1/19-8*v) = 0
( 1/19-8*v )
1/19-8*v = 0 // - 1/19
-8*v = -1/19 // : -8
v = -1/19/(-8)
v = 1/152
( 7*v+1/5 )
7*v+1/5 = 0 // - 1/5
7*v = -1/5 // : 7
v = -1/5/7
v = -1/35
v in { 1/152, -1/35 }
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