$a^2-a+1$
$-120-\:128\:\::\:-4+-7\:.\:3$
$\frac{1}{csc^2x-1}$
$x^2+8a^2+5x^2+5a^2$
$-4\cdot\left(-14\right)\cdot\left(-24\right)$
$\sqrt{y}=1-\sqrt{x}$
$\left(-25\right)-\left(_{-10}\right)$
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