$+45a^2+22a^2$
$\int_4^6\frac{2}{7-2x}dx$
$77\le5+8n$
$x^2-6x+9=12$
$\frac{\left(3+4\right)}{3-4}3^2$
$x^{-3}\cdot x^9\cdot x^{-7}$
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