$9y^2-9x^2$
$3x^2-5-3x-4x-7x^2+3$
$\frac{x^2}{9}+2xy7$
$\int\frac{5}{\sqrt[3]{2y+4}}dy$
$4y-6y-4y$
$10a\cdot4$
$\int\frac{8x^3+13x}{\left(x+2\right)^2}dx$
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