$8+-1+1$
$x^2-4x-4y+z^2-4z+17=0$
$-\frac{3}{5}x=9$
$\int\left(\frac{x+4}{x^2+8x-20}\right)dx$
$\left(4a^6b+xy\right)^2$
$2\left(-7f\right)$
$\frac{\sin\left(2x\right)}{2cos^2x}$
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