$\left(7x^2-3y\right)\left(49x^4-21x^2y-9y^2\right)$
$0.09a^6-0.6a^3+1$
$\frac{3x^5-x^2+x-2}{3x^3-1}$
$\lim_{x\to\infty}\sqrt{y^2+1}-y$
$7\cdot0^6+5$
$2x+5y=15$
$\frac{4^3}{a+2}+2^3$
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