$3+2\cdot\left(3\cdot\left(-3\right)-2\right)$
$\left(x-1\right)\left(x+3\right)$
$9k^2-8k+4<0$
$2x<4-10x$
$2^2+-1^3$
$\frac{49m^3n^4}{63m^3n}$
$\left(10xy-1\right)\left(10xy+1\right)$
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