$10\cdot30$
$\left(-6-ab\right)\left(-5-ab\right)$
$-5\cdot\left(-10+3\right)\cdot\left(+9-4\right)+\left(+11-10\right)$
$\left(3x+2\right)^2-\left(x-6\right)^2$
$y^4-12y^2+36$
$n^2y+20n^2y-19n^2y$
$\frac{a}{x}=p$
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