$23x-6x+3x-14y+6y$
$\lim_{x\to0}\left(\frac{2b^x-2}{3x}\right)$
$2^2.3^3$
$\left(x^6+10y^2\right)^2$
$\frac{3x^5+4x^3-6x^2}{4x^4-4}$
$18x+8$
$4m+-5n-m-3n$
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