Question

John has x marbles and Max gives Tom 5 of his marbles. How many marbles does Max now have?
oobleck
it depends on how many Max started with. If he had M marbles, then he now has M-5.
Anonymous
John has x marbles and Max has twice as many. Max gives Tom 5 of his marbles. How many marbles does Max now have?
Sandy
2x-5