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v in (-oo:+oo)
(1/3)*v-3 = (-5/4)*v-(3/4) // - (-5/4)*v-(3/4)
(1/3)*v-((-5/4)*v)+3/4-3 = 0
(1/3)*v+(5/4)*v+3/4-3 = 0
19/12*v-9/4 = 0 // + 9/4
19/12*v = 9/4 // : 19/12
v = 9/4/19/12
v = 27/19
v = 27/19
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