\(x+y-x-y\)
\(=\left(x+y\right)-\left(x+y\right)\)
\(=0\)
\(25x^2+10xy+y^2\)
\(=\left(5x\right)^2+2.5x.y+y^2\)
\(=\left(5x+y\right)^2\)
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