$\int_0^0\left(4x+2\right)\left(x-1\right)dx$
$\int\left(0.04t+200\right)e^{-0.04t}dt$
$\left(3x^{2}-\frac{1}{10}\right)\left(3x^{2}+\frac{7}{10}\right)$
$\frac{6}{3y-9}-\frac{1}{y-3}$
$\left(k-4n\right)\left(k+3n\right)$
$5.4-7.-2.-3+2.-10-3.-4.-2$
$7x-11-9x+2$
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