$13xy\:-\:4x\left(6\:-\:5y\right)\:+\:12x\:$
$\left(3x^2-8\right)\left(3x^2+8\right)$
$5x+2x\left(x-4\right)+7$
$\left(3-3b^2\right)^3$
$2yx^2\cdot8x^3$
$y^2-54y$
$\frac{-228}{-12}$
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