3q + 2z, although it could be 2*(3q+z)
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Assuming that the phrase "doubled by 2" is tautological, the expression for a number multiplied by 2 (or a number doubled) is 2n.
classifacation of algebraic expression according to the number of terms
a common factor
2n
an algebraic expression is an expression built up from constants, variables, and a finite number of algebraic operations (addition, subtraction, multiplication,division and exponentiation to a power that is a rational number). For example,