$\int x^6sin\left(x^7+2\right)dx$
$\int\left(\frac{x}{\sqrt{\left(4x+1\right)}}\right)dx$
$\left(2x+y+1\right)dx-dy=0$
$5-\left(2x-7\right)$
$sec2x\:-\:sin2x\:-\:cos2x$
$5\left(x-3\right)-2\left(x+1\right)=4$
$( 5 x + y ) ( 5 x - y )$
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