$x^2+2\cdot x\cdot5+5^2$
$\int\frac{14x+5}{7x^2+5x-6}dx$
$-25\cdot50$
$\frac{x^2+x-30}{x-4}\cdot\frac{x-4}{x-5}$
$\left(3f^4g^{-3}\right)^3\left(f^2g^{-2}\right)^{-1}$
$x^3+2x^2-151x=0$
$20:\left(-5\right)-8:\left(+2\right)$
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