$x^2+6x+8\le\:\:0$
$\sqrt[4]{\frac{13x}{243y^{16}}}$
$x2-28x+147=0$
$\left(2x^3+6z\right)+\left(8y^3+3z\right)$
$\left(4a^4-12a^4b^4+9b^4\right)^2$
$3x^2-3x+6-x+3$
$6+8b+6c$
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