If A = ((2x,0),(x,x)) and A ^{-1} = ((1,0),(-1,2)) then x = ? ​

Hi, I have a question and I hope anyone could answer it:

If A = (​​​​begin{pmatrix} 2x & 0 \ x & x \ end{pmatrix})and A -1(​​​​begin{pmatrix} 1 & 0 \ -1 & 2 \ end{pmatrix})then x = ?

A. 1 

B. 2 

C. 1/2

D. -2

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