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v in (-oo:+oo)
10/45 = v/27 // - v/27
10/45-(v/27) = 0
2/9-1/27*v = 0 // - 2/9
-1/27*v = -2/9 // : -1/27
v = -2/9/(-1/27)
v = 6
v = 6
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