$2^{\left(2^x\right)}+4^{\left(2^x\right)}=42$
$4x^2+4xy$
$-6-2+7+11-1$
$2x-7x$
$\left(x^2-4y^2\right)^3$
$\frac{x^5-6x^3+6x-6^2}{x^2-6}$
$3x^2=2x$
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