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Given, (1- x)/x - 2x/(1 - 2x)
= {(1- x)*(1 - 2x) - 2x*x}/{x*(1 - 2x)}
= {1 - 2x - x*1 + x*2x - 2x*x}/{x*1 - x*2x}
= {1 - 2x - x + 2x2 - 2x2 }/{x - 2x2 }
= {1 - 3x}/{x - 2x2 }
So, (1- x)/x - 2x/(1 - 2x) = {1 - 3x}/{x - 2x2 }