$\left(5x^2+9x\right)+3x$
$-4\left(8+8k\right)$
$x^2+2x-49$
$\frac{d}{dx}2cosx+3$
$\int\ln\left(x+2x^2+x^3\right)dx$
$2x\:\left(x-6\right)+3\left(x-6\right)$
$\left(ax^2-by\right)^2$
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