$k^2+11k^230$
$\left(x^2\right)^2-5x^2+4$
$x^4-2x^3-2x^3+x$
$\left(v^{-8}\right)^{-3}$
$3\sin\left(4x\right)=2$
$15b^2-20bc-18bc+24c^2$
$\lim_{x\to infinito}\left(\frac{ln\left(x\right)}{\sqrt[7]{x}}\right)$
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