00:01
Okay, so we want to solve the following for c.
00:04
So our first step is to expand everything that we have.
00:07
And once we've expanded, we can essentially combine high terms.
00:11
So let's multiply in that 2, this 5, and this negative 6.
00:20
So i have a negative 12c minus 18.
00:25
And then i have 15c minus 10, minus a bracket.
00:31
And then we have 14c minus what's 2 times 8.
00:36
That's a 16.
00:38
And now let's combine like terms.
00:41
So inside of our brackets, we have c minus 12c, so that's negative 11c, and then 3 plus 18, but a negative of that, so that's minus 21.
00:52
That's equal to 15c, 1 is 10.
00:56
And then let's combine like terms inside of this bracket, so that's 14c minus 4c, so that's a 10c.
01:02
And then we have negative 16 plus 7, so i get a negative 9.
01:07
And now let's multiply in this negative sign here and this negative 4...