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v in (-oo:+oo)
35 = (5/9)*v // - (5/9)*v
35-((5/9)*v) = 0
(-5/9)*v+35 = 0
35-5/9*v = 0 // - 35
-5/9*v = -35 // : -5/9
v = -35/(-5/9)
v = 63
v = 63
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