Given that $$V_1Z_1 =V_2 Z_2 +V_3 Z_3, $$
express $V_1/( V_2 + V_3)$ in terms of $Z_1, Z_2, Z_3$ only. The V's should be at the left hand side. while the Z's at the right hand side. Please the question is not from any topic in pre-calculus or algebra but instead I am trying to prove something with it.