$7^4\cdot7^{-2}$
$8a-2b+12a-2a-4b$
$24axy^2-12bxy^2$
$-4\cdot\left(-7\right)$
$\int_0^{\infty}\left(6e^{-3x}\right)dx$
$\sec^2x+\csc^2y=4$
$k^m\cdot k^n$
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