$3x+4x-9x$
$7-7\left(_{-2v-9}\right)$
$81x^2^a-16x^2^a+2$
$f\left(x\right)=\sqrt{x^2}-2x+3$
$\sqrt{160}$
$\left(6^4.2\right)^3$
$\log\left(x+2\right)+\log\left(x-2\right)$
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