$9^4\cdot9^{-4}$
$2\left(x+1\right)+2\left(1x+5\right)$
$12x^5+9x^2-4x$
$\frac{x}{\left(x^2-1\right)\left(x^2+1\right)}$
$34-65+89+88+765$
$\sqrt{\left(x+4\right)\left(x+2\right)}$
$-3x^2+6x-2$
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