$x^{2\:}+y^2+z^2+8x-6y-4y\:-7$
$\frac{2x+6}{2}-x=3$
$\left(9a^2+2b\right)^2$
$a^2-1=b$
$4z^2.6z^{10}$
$\left(-30\right)\left(7\right)\left(-4\right)$
$5p^2-9p$
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