How do you solve 7x = 2x + 15?

1 Answer
Jun 2, 2017

x = 3

Explanation:

7x = 2x + 15

We can move 2x to the other side, changing it from positive to negative.

7x -2x= 15

5x= 15

Now we can work backwards. The last thing that happened to x is that it was multiplied by 5 to get to 15, so in working backwards, we will do the opposite to 15 to get x.

x= 15 ÷ 5

color(blue)(x = 3