$\frac{7}{15}-\frac{9}{10}\left(2y+1\right)-\frac{2}{5}\left(4y+3\right)$
$-3x^4+9x^2$
$\frac{2x^2-2x}{7x}$
$332+129$
$\lim_{x\to0}\:x^3+4x^2+4x$
$2x^32x^2-4x-4$
$y^3-y=0$
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