00:01
So on this problem, we have to translate the sentence given to us into an equation.
00:05
And then we'll solve the equation to find the unknown number.
00:09
So there's some key words in the equation.
00:12
It highlights sum, a number, and is.
00:16
So some means we're doing addition.
00:20
And so we're looking at the sum of negative five and a number.
00:26
So negative five is just the number negative five.
00:28
A number means some unknown number that we have to figure out.
00:34
So we're going to use a variable to stand for a number.
00:38
X is a variable that we often use.
00:40
You could use any variable...