$-\left(90-2y-3z\right)^2$
$4\left(c-a\right)y-2dc\:+\:2ad$
$\left(a^3-o\right)\left(st-o\right)$
$5^2-2\cdot5\cdot4+4^2$
$\left(7x^2-4y\right)^5$
$-\frac{15}{5}$
$\:\:8x^2-26x-7$
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