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