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hello my name is Maria and this is Matt Lee my mascot in this lesson we are studying some scales problems or problems where we have a pan balance it is like a seesaw you know seesaw it can tilt one way or the other if one side is heavier but in all these problems we are imagining that the two sides are equal they have the same weight so to speak and you can think of these weights as in kilograms or in pounds whichever way you prefer but Im just gonna think of them as numbers Im used to that and these pan balances or these scales are basically equations they have unknowns is an unknown shape or unknown weight how much does it weigh and thats a task to solve in all these problems theyre like puzzles right oh nothings getting exciting puzzles now this first one its very easy right how much does this square way oh its equal to its equal to 9 and this whole balance here models for us the equation if I use X I would say x equals 5 plus 4 okay thats an easy one lets go to the next