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v in (-oo:+oo)
-7/2 = (-5/4)*v+8/7 // - (-5/4)*v+8/7
-((-5/4)*v)-7/2-(8/7) = 0
(5/4)*v-7/2-8/7 = 0
5/4*v-65/14 = 0 // + 65/14
5/4*v = 65/14 // : 5/4
v = 65/14/5/4
v = 26/7
v = 26/7
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