$\left(8y+8a-9y+9\right)-\left(8a+9y-10\right)$
$8x+12x-6x+9$
$36x^{16}-25$
$\left(9x+7y\right)\left(81x^2-63xy+49y^2\right)$
$\int\frac{10}{3^x}dx$
$4\sqrt{3\left(1+2\right)}$
$ydx\:+\:x\left(lnx-lny\right)dy=0$
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