Evaluating the expression
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When a given set of values for the variables are substituted in the expression the result is the value of the expression.
It is called solving the equation. * * * * * I would suggest that the answer is "evaluating it".
For example if it was y+y+y it would be 3y. or 3x+2y-1x= (3-1)x + 2y = 2x + 2y = 2(x+y) I'm not sure that the above addresses the question of rational algebraic expressions. You can simplify by finding common factors between numerator and denominator, or try long division, if no factors are evident. See the related link for "How do you divide rational algebraic expression"
It means finding the value of the expression.
You try finding a factor. If there is no proper factor, then it is a prime.