$x^2-50x+225$
$\frac{6x^2+21x-11}{x+4}$
$\frac{8}{\left(\left(si+3z\right)^2\right)}$
$2x+9+4x-6$
$2x-3\:1x+8\:2x+4\:1x-3\:5-2y$
$4a^2+8a^2+4$
$\left(7ax^2+6x\right)\left(7ax^2+8y\right)$
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