$\left(a\:+\:4\right)\:\left(a\:-\:2\right)\:$
$-4\:.\:\left(\:-9\:+\:7\:\right)\:=\:\:\:\:$
$-32x^2=-32x^2$
$6\cdot10^3\cdot2\cdot10^4$
$\frac{1}{3x-2}\le4$
$\frac{y^2-x^2}{y+x}$
$\frac{3a^2b^2c^2-2abc+ab^2c}{abc}$
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