$-\frac{2}{5}fg^2+\frac{7}{5}mn-\frac{6}{5}fg^2+3mn$
$8x^3+6x^3+11a-3a$
$-m^2n^2\:\cdot\:mn$
$b^4+625b^2+168^2$
$\int\left(-2x^{4n}\right)dx$
$\left(x-20\right)\left(x-25\right)$
$1+9+4x^2$
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