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v in (-oo:+oo)
(1/5)*v-(1/7) = -1/2 // + -1/2
(1/5)*v-(1/7)-(-1/2) = 0
(1/5)*v-1/7+1/2 = 0
1/5*v+5/14 = 0 // - 5/14
1/5*v = -5/14 // : 1/5
v = -5/14/1/5
v = -25/14
v = -25/14
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