$\frac{\left(5x^27x+6\right)}{\left(-x+2\right)}$
$\left(b^{2n+3}+a^{3n}-4\right)\left(b^{2n+3}-5+a^{3n}\right)$
$18\cdot25$
$ab+6b-7a-42$
$x^2-8=41$
$\int10\arcsin\left(6x\right)dx$
$\lim_{n\to-3}\left(\frac{n^2-n-6}{n^2-9}\right)$
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