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v in (-oo:+oo)
-((5/3)*v)-4/7 = -1/3 // + -1/3
-((5/3)*v)-4/7-(-1/3) = 0
(-5/3)*v-4/7+1/3 = 0
-5/3*v-5/21 = 0 // + 5/21
-5/3*v = 5/21 // : -5/3
v = 5/21/(-5/3)
v = -1/7
v = -1/7
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