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v in (-oo:+oo)
-((1/2)*v)-1/5 = -1/7 // + -1/7
-((1/2)*v)-1/5-(-1/7) = 0
(-1/2)*v-1/5+1/7 = 0
-1/2*v-2/35 = 0 // + 2/35
-1/2*v = 2/35 // : -1/2
v = 2/35/(-1/2)
v = -4/35
v = -4/35
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