$-7^2-\sqrt{121}$
$\left(7a-6\right)\left(7a+6\right)$
$\frac{dy}{dx}=3-\frac{y}{x}$
$\int8x^3\sqrt{7x^4-\frac{2}{5}}dx$
$13+10\left(-4\right)$
$x\ge6-x$
$100+150+300$
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