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v in (-oo:+oo)
25 = (5/9)*v // - (5/9)*v
25-((5/9)*v) = 0
(-5/9)*v+25 = 0
25-5/9*v = 0 // - 25
-5/9*v = -25 // : -5/9
v = -25/(-5/9)
v = 45
v = 45
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