ANSWER: 14
Hi!
The first thing you need to do is do the INVERSE OPERATIONS of what you are given. Start with addition/subtraction
We have 5x PLUS 10
The inverse (opposite) of adding is subtracting, so subtract 10 from both sides of the equation!
80 - 10 = 70
5x + 10 - 10 = 5x
Okay, so now we have 5x = 70. 5 and x written together signals multiplication, so that means you have to do the opposite, division!
5x divided by x = 5.
70 divided by 5 = 14
x = 14
So, your answer is 14!
You can check your answer by inserting it in the problem:
5 x 14 = 70. 70 + 10 = 80