$4a^2-\:81y^4$
$\left(x+18\right)\left(x+9\right)$
$d=c+19$
$\frac{\left(9x^2-26x-5\right)}{3t^2-5t-2}$
$\left(x-7\right)\frac{dy}{dx}+2=0$
$\left(6\cdot10^3\right)+\left(2\cdot10^2\right)$
$x^2-20x+19=0$
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