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v in (-oo:+oo)
v/4 = (3*v)/5+v/10-9 // - (3*v)/5+v/10-9
v/4-((3*v)/5)-(v/10)+9 = 0
v/4+(-3/5)*v-(v/10)+9 = 0
9-9/20*v = 0 // - 9
-9/20*v = -9 // : -9/20
v = -9/(-9/20)
v = 20
v = 20
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