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[x^2/(2-x)^2] =5.3
[x^2/(4-4x+x^2)]=5.3 Note the sign of +4---not -4.
x^2 = 5.3*(x^2-4x+4)
x^2 = 5.3x^2 -21.2x + 21.2
0 = 4.3x^2 - 21.2x + 21.2
And solve that quadratic. I get something close to 3.5 and 1.4 and you know 3.5 doesn't make sense because the initial concn was 2 M. Hope this helps.