$\left(\frac{1}{5}a+3b\right)^{2}$
$16p^2-144q^2$
$\lim_{x\to0}\left(\frac{25}{x^2}\right)$
$7x+y=19$
$\int_3^1\left(\frac{\left(5t^3-4t\right)}{t^4-16}\right)dt$
$\left(-7+8x^5\right)^2$
$-x<5$
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