Expressions are just expressions. Art is an expression and no one can "solve" art.
You need problems to solve. In algebra, you'll most likely be looking for equations to solve. Generally you are looking for a simple way to express a variable or to equate the variable to a number. This can be done using what are called "algebraic manipulations". Usually this involves just adding, subtracting, multiplying or dividing each side of an equation (an expression need not have "sides"), however there are many, many different operations than these.
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There are lots of different types of problems in algebra; you have to learn each type separately. For example, how to add similar expressions; how to multiply expressions; how to factor polynomials; how to solve equations; etc.
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algabraic expression
the sum of a number and 16 is equal tu 45
When given two names (variable expressions) for the same quantity, you can use algebra to solve the equation.