$25b^3+10b^2$
$9-3x-\left(-8y\right)+9x-y$
$+8+523$
$\frac { x ^ { 4 } - 4 x ^ { 2 } + 6 } { x + 2 }$
$\int\left(\frac{2}{1+\sqrt{x}}\right)dx$
$\lim_{x\to0}x^{90.4345x}$
$\frac{7}{y^{-4}}$
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