$\frac{d}{dx}x+xy+y-2$
$x^2-\frac{5}{6}x+0$
$6.\:^{\left[\left(-3\right).4\:-\:2.\:\left(-7\right)\right]\:+\:\left(8+3\right).\:\left[5+2.\left(-3\right)\right]\:-\:\left(+2\right)^2}.3^2$
$\left(-\left(x\right)^2\right)-8x$
$3a^2b-2ab^2$
$\left(n+7\right)\left(n-7\right)$
$2x-1-x+5$
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