Using the shorthand
Experienced programmers tend to try and type as little as possible to accomplish their goals (so long as it is readable).
As a result, it's important for you to be familiar with and use the shorthand for when you have a variable and you are performing a math operation on itself!
var += 1 is shorthand for var = var + 1
var -= 3 is shorthand for var = var - 3
var *= 5 is shorthand for var = var * 5
var /= 2 is shorthand for var = var / 2
Use this shorthand to follow the steps in the comments to perform the math operations on the variable 'change_me'.
Test Cases
Solution 1
change_me = 2
# Use the shorthand to multiply change_me by 3 and store the result in change_me
change_me *= 3 # 6
# Now add 10 to change_me
change_me += 10 # 16
# Subtract 4 from change_me
change_me -=4 # 12
# Divide change_me by 2
change_me /= 2 # 6