$-\sqrt{16}+\sqrt{25}-\left(8-9\right)^4-2^2$
$-xz-yz$
$81y^2-25z^2$
$\sqrt{x^2+2\left(x^2-1\right)+6}$
$-5x\:-83<\:4\:-\:x$
$2x\log_{10}\sqrt{x}$
$10x=120$
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