simplify (x/2-2/5)(2/5-x/2)-x^2+2x
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(x/2-2/5)(2/5-x/2)-x^2+2x
(x/2-2/5){-(x/2-2/5)}-x^2+2x
-(x/2-2/5)^2-x^2+2x
-(x^2/4+4/25-2x/5)-x^2+2x
-x^2/4-4/25+2x/5-x^2+2x
(x/2-2/5){-(x/2-2/5)}-x^2+2x
-(x/2-2/5)^2-x^2+2x
-(x^2/4+4/25-2x/5)-x^2+2x
-x^2/4-4/25+2x/5-x^2+2x
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