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v in (-oo:+oo)
3 = v/7.5 // - v/7.5
3-(v/7.5) = 0
3-0.13333333*v = 0
3-0.13333333*v = 0 // - 3
-0.13333333*v = -3 // : -0.13333333
v = -3/(-0.13333333)
v = 22.50000056
v = 22.50000056
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