$\int_0^b\left(x^4e^{-x}\right)dx$
$5^3\cdot5^2.5^4$
$3\left(x+4\right)-6x=8-3\left(x-5\right)$
$\left(3x+4\right)\left(2x+1\right)$
$3n^2-11n-20$
$\left(x+1\right)^2-2\left(x^2+1\right)$
$-2\:.\:\left|11+3\:.\:\left(5-7\right)\right|\:-3\:.\:\left(8-11\right)$
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