$6x+8x-3x+7x$
$\frac{21u^7}{3u^4}$
$36x^2-18xy+4y^8$
$\left(a^2-b^2\:\left(a-b\right)\right)$
$+12.5-10.9$
$\log\left(e^{2y}\right)x$
$\left(3x^2+4y+2x^2-2y\right)^2$
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