$3x-7y+2z-6x+4y$
$\left(-9x+1\right)\left(-9x-1\right)$
$\frac{3x^3+2x^2-4}{2x^2+1}$
$\left(60\left(-\frac{1}{10}z^6+\frac{1}{12}\right)\right)^2$
$4\cdot7-6$
$\lim_{x\to\infty}\left(\frac{6x^9+12x-3}{8x-3x^9+2}\right)$
$x^2-30x+225=441$
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