( x + y ) - 1/2 ( 2 + x - 2y ) {answer this step wise and explain}
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=(x+y)-(1+X/2-y)
=x+y-1-x/2+y
=x/2+2y-1 ans...
=x+y-1-x/2+y
=x/2+2y-1 ans...
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