$2\cdot x=26$
$3a+1;\:a=2$
$54x^3-6x$
$\frac{x^3+2x^2-5x+7}{x+1}$
$-1-\left(-15\right)$
$\lim_{x\to6}\left(\frac{x^3-1}{x-1}\right)$
$3ab^2+4a^2b-9ab^2-3a^2b$
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