$6m+4n-9km-6kn$
$\left(9y+x\right)\left(9y-x\right)$
$2x-34x$
$2.2^2-0.7\cdot1.8$
$\int e^{4x-9}dx$
$\left(6x+2m\right)^2$
$19ba^2b^6\:\frac{1}{4}$
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