Algebra - how do i solve for this

[vorcil]

$$\eta = 1 - \frac{Q_c}{Q_h}$$

I have everything except Qh,

i stuck the equation into my graphics calculator and get 13039

n = 0.27
Qc = 9519 J

how'd i solve for Qh using that equation?
cheers

 

[ryan88]

$$\eta = 1 - \frac{Q_c}{Q_h}$$

$$\eta Q_h = Q_h - Q_c$$

$$Q_h(1-\eta)=Q_c$$

$$Q_h=\frac{Q_c}{1-\eta}$$