$y'-\frac{y}{x}=x$
$[\left(\frac{7z^{-2}b^{6}}{2^{2}nz^{-4}a^{2}}\right)^{-2}]^{3}$
$\left(11a-7b\right)\left(7b+11a\right)$
$8x^3-36x^2+54x^2-27x^3$
$-2x=14$
$\sqrt{20x^3}$
$169+b^2-26b$
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