Question

I don't know how to work out the equation below

Answer 1

3(x + 4) = 27

First, since our variable is already on one side by itself, we can start out by dividing each side by 3.
$x + 4 = \frac{27}{3}$

Second, we need to simplify our fraction we just got. To do so, think of it as this way: what times 3 equals 27? Or, (3 × x = 27). Either way, the answer is 9. 
$x + 4 = 9$

Third, we can remove (subtract) 4 from each side of the problem. This will give us the answer after we subtract it.
$x = 9 - 4$

Fourth, our last step is to subtract 9 - 4 to get our answer. (9 - 4 = 5), meaning 5 is our answer.

Answer: $\fbox {x = 5}$