$5x^2+\frac{2}{5}x$
$x^2+25y^2=100$
$\left(13x-7\right)\left(13x+7\right)$
$2d+4c=90$
$\left(a^{-1}+b^{-1}\right)^2$
$u+v=-13$
$\left(2x-6\right)^2+24x=4x^2+36$
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