$6a^2a^8a$
$x-4x+5x^2-4x^2$
$8x^2-17x-21$
$5pq\:-\:4p\:+\:7n\:-\:2p\:-\:11pq$
$\frac{n^6+1}{n^2+1}$
$2\left(-1\right)^3\left(2\right)+4\left(-1\right)^2\left(2\right)^2-\left(-1\right)+2$
$4\left(x+2\right)-3\left(x-5\right)d$
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