$r^2-1$
$3^0-3^4\cdot3^{-5}$
$-2+-5+8+-3+-2u+-8$
$8=x+25$
$\left(xz-yw\right)\left(xz+yw\right)$
$a-3+10$
$9\:\left(12\right)\:-\:9\:\left(7\right)$
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