$81x^4y^2-144x^2yn+64n^2$
$-7x+1\ge22$
$-5^2:\sqrt{25}-\left(1-4\right)$
$\frac{6\cdot z}{5}\cdot\frac{9\cdot z}{5}$
$\ln\left(y^{3x+0}\right)y'-5x'\:y=0$
$\int\cos\left(7\right)ydy$
$\frac{m^6+n^6}{m-n}$
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