$\left(1+y-z\right)^2$
$2x\left(3x-1\right)+3\left(2x-2\right);\:x=-1$
$-2-3-1-3-4+12$
$3\left(2+2\right)-4\left(5-9\right)$
$z^2-2z+2$
$\left(x^a\right)\left(2x^{2a-1}y^{x-2}\right)$
$x^2+6x+0$
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