$\frac{7}{\left(6+x\right)^3}$
$x^2+3\cdot x-18$
$\int\frac{x-2}{x^2-2x+1}dx$
$.5\int sec^3\left(x\right)dx$
$4^2+10x$
$3xyz+6xyz^2-9x^3y^5z^7$
$2x+2b^2$
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