$4\left(x-7\right)<3\left(x-12\right)$
$x^2+21x+196$
$3x\left(_{-7}\right)$
$\left(x-2\right)^2-\left(x-2\right)^2$
$6x^0$
$\int_{-4}^4\pi\left(1-\frac{x^2}{16}\right)^2dx$
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