$30x^4\cdot7^{3x^2}^{+8}$
$\left(\frac{4}{7}x^4-\frac{6}{5}y^2\right)^2$
$\int_0^1\left(\frac{e^x}{81-e^{2x}}\right)dx$
$\lim_{z\to2}\left(\frac{z^2+4}{z-2}\right)$
$5+x<12$
$\frac{2x^5+5x^3}{x}$
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