$\left(\left(-2\right)^2\right)^0.\left(-2\right)^2.\left(-2\right)$
$-x^2=-3x+18$
$7x-8+-3x-7$
$0.5\cdot0.25\cdot0.0625$
$\frac{-xy^2z}{-xy^2z}$
$\left(-8x-9y\right)+\left(-x-5y\right)$
$\left(x+4\right)^2-\left(x-4\right)^2$
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