672 = (-24b)
Now you see how that's a time 24?
Well you gotta do the opposite to both side so..
672 = (-24b)
___ ____
-24 -24
-28 = b
(but the variable has to be on the left side for whatever reason, so you gotta flip it)
b = -28
Now let's check;
672 = -24(-28)
672 = 672
:) We gucci
(Now here's the steps with no interruptions)
672 = -24b
___ ___
-24 -24
-28 = b
b = -28