Frank is practicing a new dance move.  It starts with him take 5 steps back, and then 10 steps forward, and then 2 steps back, and then double that amount forward.  How many steps forward is Frank from his original starting point?
Frank stars by taking 10 steps forward from a position 5 steps behind where he started, so he's 10-5= <T>subtract(10, 5)=5 steps forward in total
Frank then takes 2 steps back, meaning he's now 5-2=<T>subtract(5, 2)=3 steps forward in total from where he began
He then takes double the previous amount of 2 steps forward, so he takes 2*2= <T>multiply(2, 2)=4 steps forward
Since Frank was 3 steps forward before that, that means Frank finishes 3+4=<T>add(3, 4)=7 steps forward
