$196a^8+168a^4b+36b^2$
$a^2-4a+3$
$-20=4+4x$
$\left(x^{2n+1}\right)^2$
$-y+2+6y+2-10u+6u+u+9u$
$\left|\left(-2\right)^{-2}\right|^3\cdot\left(-2\right)^3\cdot\left(-2\right)^4$
$\sqrt[4]{16.81}+\sqrt[3]{\sqrt{64}}$
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