$4x^2-6x$
$4^2.4^5$
$\int7\arcsin xdx$
$x+1<2x-1$
$+7\:-\:\left[\:+1\:-\:\left(\:+10\:\right)\::\:\left(\:+5\:\right)\:\right]\:$
$11b-9b$
$9xy+7x+4x-5xy+2x$
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