Can you crush this algebra problem in 7 seconds? If you are taking a math placement test or an entrance exam soon, you need this hack. It is called backsolving. Instead of doing the algebra, just plug in the answer choices! Start with C. If you plug in 1, you get 6. That is too big! Now you can kick out C, D, and E all at once. The answer has to be 0. This is the fastest way to get easy points on your next standardized test.