$\frac{2x^4+7}{x^2-6x+8}$
$\frac{a^mb^n}{a^2b^3}$
$m^2n^2+mn$
$8x^2+26x+15$
$\int\frac{\left(7x-4\right)^n}{n\cdot7^n}dx$
$\left(m-19\right)\left(m+3\right)$
$7m^2+6m-1$
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