$\frac{\left(-2\right)^4.3^5.\left(-2\right)^8}{\left(-2\right)^7.3^3}$
$-9+7+\left(-3\right)+19+13$
$24x^2-38x+15$
$6\sqrt{\frac{1}{9}}$
$-3b-3c$
$\frac{6x^2+2y^3}{2x}$
$231-361+264x-576x$
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