$x^2-8\le0$
$4x^4-36x^2+81$
$ab-3a$
$\frac{169yx}{\left(y-13\right)\left(x-13\right)}$
$4a^2-8ab^2+4b^4$
$50-\frac{t}{5}$
$7y+5y-5y$
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