$\left(7s-3t\right)^2$
$z^2-z-201$
$\left(x^3-2\cdot y\right)^3$
$-2x+9x-x$
$\left(-2x\right)\left(-4x\right)$
$2\left(x+y\right)=x-y$
$9x^2-6x+x=0$
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