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Learning the expressions is the same thing as learning your multiplication tables - it helps you to understand algebra. And algebra allows you to understand things like logic, statistics, and all sorts of calculations where you don't know enough numbers to do a straight addition or multiplication or subtraction or division.
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There appears to be no inequality in the question: only some disjoint expressions. Expressions cannot be solved.
There appears to be no equation in the question: only some disjoint expressions. Expressions cannot be solved.
These two are both similar because they are both expressions.