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We have learn a lot about the equation since we were young. Mostly we know it in the format of 2 + 5 = ____ or 5 + ___ = 7. Then when we were growing up, it begin more complex with many variables.The equation actually is related to our daily life, for example, in our daily lives, in this image, tell about when we go to buy something in the market, when the seller and buyer need to calculate their change such as when we buy pork cost by 200 baht and then we pay 500 baht to the seller. So the seller and us need to find the variables that how much money he need to pay back and we need to get back. we can see that in our daily lives related to the equation.
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