$3e^{3-3x}-6=-31$
$x_t+25x_{t-2}=2^t$
$6x^2y-2x^2y+8x^2y-5x^2y+11x^2y$
$\frac{2}{3}\cdot3$
$2x\sqrt{6xy^2}$
$\lim_{x\to1}\left(\frac{x+2}{\left(x-1\right)^2}\right)$
$64a^3-\:125b^3$
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