Equations are not that hard at all. It all depends on the question or problem. You can create your own equation for anything, like y=x-7. Of course, the majority of equations are mostly used for school. 
         What are some questions you can use for equations? Well, there are many of them actually. However, let's ask ourselves our own questions. The equation for now is y=6x. If you get 6 dollars as an allowance for one week, how much time will it take to save up for 18 dollars? Now let's see. The "x" stands for week. So we should substitute a number for each week. Since you get 6 dollars per week, it would be 6x1. What happens if it's 2 weeks? If you multiply 6 by 2, then it would be 12. Keep going until you get to the number you're looking for. There are many questions and answers the world might ask just for this equation, so you should do your best and prepare for that. 



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