How to solve this equation for $r$? [closed]

I have a problem.... I have to express unknown "r" from from this equation:

$$Y\times r=(-Z\times 2r\times L)+(z\times K^2\times 0.5L)$$

Can someone help me ?

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closed as not a real question by Andrés E. Caicedo, Amzoti, Alexander Gruber♦, Start wearing purple, J. M.May 18 '13 at 6:09

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This matematic is too hard – Harold May 15 '13 at 15:01
show some effort from your side – iostream007 May 15 '13 at 15:01
do you want find out value of r in terms of Y,Z,L,K? – iostream007 May 15 '13 at 15:02

Hint: move the term containing $r$ to the left by adding $2ZLr$ to both sides, then use the distributive law to write the left as (something)$r$, then divide both sides by (something)