$12x^2-80x+100$
$x^2-18x+21$
$-\left(-2+6\right)+\left(9-4\right)$
$\frac{2x-1}{4}+\frac{x+3}{5}$
$\left(5a-3b\right)\left(2a+2b\right)$
$^{x^2+10x+2=0}$
$12=3n+n$
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