$9x^2-49$
$\frac{-25a^2b^3}{5ab^2}$
$8\cdot3.33$
$\left(2+\sqrt{3}\right)+\left(2-\sqrt{3}\right)+1$
$-5\cdot4-3$
$-20a+45a$
$5\sqrt{\frac{16}{25}}+7\sqrt{\frac{36}{49}}$
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