Solve the equation. 7b - 3 = -2b + 24

Equation: 

When solving these type of equations, you have to get the variable on one side by "itself".

To start off, add 2b to both sides



Now add 3 to both sides



It is now 

Now divide 27 by 9 (don't worry about the variable because you're dividing to FIND the variable value)

 ÷ 

 

If rappelled means he fall down, I'd say he's need to climb 40 feet up. Because he rappelled 30 feet down, -30 feet from where he used to be, and then he fell an additional 10 feet down, so -10 from the -30, which is -40. He needs +40 feet to get back up. I'd say the answer's 40 feet climb.