$\left(5xy-6\right)\left(5xy+6\right)$
$-5^{2}-\frac{\left(-2\right)\left(-2\right)\left(-3\right)\left(-2\right)}{\left(-6\right)\left(-4\right)}$
$\int3xe^{-2x}dx$
$x^2-6x-60$
$\frac{n^2}{9}+2nx+9x^2$
$49x^2-49x-8$
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