$2x-x+4^4-x^2$
$a\left(b-2d\left(3a-2f\right)\right);\:a=-2;\:b=-1;\:d=\frac{1}{2};\:f=2$
$8x^2+72x+324$
$2ax+2ay+4x+4y$
$4x-10x+7x-3x$
$\lim_{x\to1}\left(\frac{x^{9a}-9ax+9ax-1}{\left(x-1\right)^2}\right)$
$3100-2.6$
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