UPSKILL MATH PLUS

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$$6x$$; $$4y^2$$; $$5x+z^2$$ and $$1+y+y^2$$ are some algebraic expressions.
Suppose an algebraic expression $$a + 2$$ is generated. In this '$$a$$' is a variable, and '$$2$$' is constant, and the expression is combined by algebraic operation '$$+$$'.