$\int\frac{5x+9}{x^2-9}dx$
$-13u-6=7$
$\left(-1\right).\left(-2\right).\left(-3\right).\left(8\right).\left(-4\right)$
$3y^2+3x^2$
$72x^2+5x-2$
$\left(a^4+b^4\right)\left(a^4-b^4\right)$
$-7>13-4x$
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