$3h\:=\:11\:+\:4h$
$0-\left(-13\right)$
$7ab+2bc-3ac+2ab-7bc-5ac+2bc$
$6m^2+24m^2$
$n^{''\:}+2n^{'\:}+n=0$
$x^2-a-1\left(x+a\right)$
$3x^2-3x+2$
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