$\left(n-7\right)\left(n+2\right)$
$67.5-15.5$
$x^2-3x+2>2+x^2$
$\left(a-10\right)\left(a+10\right)$
$cos8x-cos4x$
$5x-3y=18$
$\int\frac{x^2-x-5}{\left(x^2+5\right)^2}dx$
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