Hellppp!!!

in the reaction 2HI - H2 + I2, the equilibrium constant is 0.020. If 0.200 mol of HI is placed in a 10.0-L flask, how many moles of I2 will be in the flask when equilibrium is reached?

Question

Hellppp!!! 

in the reaction 2HI -> H2 + I2, the equilibrium constant is 0.020. If 0.200 mol of HI is placed in a 10.0-L flask, how many moles of I2 will be in the flask when equilibrium is reached?

anonymous · Answer

I got it until the x and stuff like 
[x][x]/(.02-2x)
and now I don't know how to solve for x ...

anonymous · Answer

@ganeshie8 I'm sorry but could you help me please? I have a test tomorrow and I need to know the concept of this... chemistry :(((