$6x+3<x-9$
$\left(x+y\right)^2\cdot\left(x-y\right)^2=x^4-2x^2y^2+y^4$
$-9-\left(-10+\left(15-25\right)\right)$
$-9-k$
$\frac{19n^3+38n^2}{-57n^3+38n^2}$
$8f+9-7-5f$
$-2+5\left[3+5+7-20\left(3+5-9\right)\right]$
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