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I believe mathematics may be complicated when we are not able to "translate" the problems. When learning new materials, it is important that a teacher is able to express the mathematical functions in a way that is easy to understand, for example we may explain how "x" may be replaced with "apples", which is why its numbers can not be associated with numbers in relationship with "y", whom we can take as "cherries", since apples and cherries are different. This leads us to understand how the relationship between apples and cherries work, and thus the use of x and y is applicable in real life as it is flexible in algebra!