$20 - 5 \cdot 4$
$\int\frac{8}{\left(4+5x\right)^8}dx$
$81x^2-15y^2$
$3xy-6x^3+9x^2$
$\frac{7x^2+x^3-1}{x-5}$
$3x^2+y=14$
$\left(5x^2-4\right)\left(5x^2+5\right)$
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