$9x^4\left(3x^3\right)$
$27x+18$
$6x^2+x$
$a-a+3a$
$\tan\left(-x\right)=-tanx$
$x^2+2xy+y=1$
$\int_6^{\infty}\left(\frac{6}{x^2+x}\right)dx$
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