$7\sec x-7\cos x$
$x+\frac{6}{x}=-7$
$\left(6xq^3rp^6\right)\left(-4p^3q^6xr^8\right)$
$4x^2-1=354$
$\left(a-3b\right)\left(a+11b\right)$
$9p^{2+12+36}$
$-k^3+2k^2+k-2$
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