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v in (-oo:+oo)
(1/4)*v-(3/7) = (2/7)*v-(1/4) // - (2/7)*v-(1/4)
(1/4)*v-((2/7)*v)-(3/7)+1/4 = 0
(1/4)*v+(-2/7)*v-3/7+1/4 = 0
-1/28*v-5/28 = 0 // + 5/28
-1/28*v = 5/28 // : -1/28
v = 5/28/(-1/28)
v = -5
v = -5
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