2(15-2n)
Look for the greatest common factor of 30 and -4n. Put it out front, then divide each term by this number to get the expression in the parentheses. 30/2 = 15, -4n/2 = -2n.
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There is no factor of the expression in the question.
a common factor
Multiplicand times multiplier equals product. If the expression includes a variable, the numerical factor is the coefficient.
Factor out the Greatest Common Factor.
A number or expression that can be multiplied to get another number or expression is called a factor.