$\:-\:\left(-2x-4\right)\:-\:\left(5x-3x+2\right)=\:-4x\:-\:\left(-\:8x\:+\:2\right)$
$\left(x^3-a^3\right)\left(x-a\right)$
$\left(6m+3n\right)\left(6m+3n\right)$
$-3.\:\left(-5+10\right)\:-\:\left(-1\:-\:16:\:8\right)$
$428=9+x$
$4x-20$
$\log_{18}\left(4b\right)=\log_{18}\left(3b\right)$
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