Question 768973

Solve squrrt2x + x = 4 for x.
I got lost, so my answer isn't an option. Not sure where I went wrong.
sqrrt2x + x = 4
sqrrt2x -x = 4 - x
sqrrt2x = 4-x
(squrrt2x)^2 = (4-x)^2
2x = 16-4x-4x+x  (Here is the error) 




Answer 
A. x = 2





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