00:01
In this problem, we're going to go ahead and factor everything that we can and then see what we can cancel out.
00:06
So for example, at the bottom here, i can take a 10 out, bottom left.
00:10
I'm going to factor out of gcf of 10, and i'm left with r minus 7.
00:14
So i'm going to go ahead and cross that out because i no longer need it.
00:17
On the right with the 8 and the 16, i'm going to factor out an 8, and this leaves me with r plus 2.
00:23
So again, i'm going to cancel this one out.
00:26
Now, the 7 minus r and the r minus 7 looks like we can almost go ahead.
00:30
And cross those out, but it's not in the same order.
00:34
So when we see something like that, this is very common, we're going to rearrange it.
00:38
So it says negative r plus seven, and then we're going to factor out a negative.
00:42
So when i take out that negative, now everything is going to change...