$y+272=657$
$\left(\frac{5}{4}x+\frac{1}{7}y\right)^2$
$4\cos\left(4x\right)=3$
$y=\left(3+\frac{2}{x}\right)^{4x}$
$\frac{dx}{dy\:}=\frac{y}{2x}$
$5n^2-340n$
$9x^3-x$
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