Computer Games Keep Lagging

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. Solving these equations other

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1. 10R +40 = 65R = R-28 to find?
   
2. (60R +5) / (12R-2) find R = 4 =?
   
3. k / (4-k) = 2 k = find?
   
4. 1 / (2Q) = 0.5 find Q =?
   
5. R1R2 / (R1 + R2) to find R1, R2 =?
6. Vcc = Vce + Reich + RcIc find Ic =?
7. Av=- hfeRc/(Rc+hie) trovare Rc, Rb, hie=?