$a3:a$
$4x^2+9y^2-12xy$
$-13\:+\:+7\:-\:-10\:-\:-99\:-\:-1$
$4n+7-8n+5-3n^2$
$\frac{x^3+8}{x-2}$
$20ax^2-8ay^2-5bx^2+2by^2$
$\frac{\left(4+x\right)^2+16}{\left(4+x\right)+4}$
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