$\left(8x^4\right)\left(9x^2\right)$
$81^{0.5t^2+t}$
$\left(5^x-a^y\right)^2$
$14x^2+42x$
$x^2-14x+16=-8$
$2r+8r=-3+6r+r$
$-\left(-2+3-5\right)+\left(13-6\right)$
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