$x+8+6x+50$
$\left(3x+5y-10z\right)^2$
$\frac{1}{x^2}+4x+4$
$7b+3b+2b$
$-2xy\cdot4x^3y^2\cdot5x^3y^5$
$\lim_{x\to-1}\left(\frac{6x^4+2x^3+x-3}{x+1}\right)$
$2a^2b-\frac{3}{2}a^2b-1$
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