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Illustrate a mathematical concept, specifically greatest common factor (GCF). Set the concept within a classroom environment, featuring a blackboard with incomplete equations of '20x' and '-4' written in chalk waiting to be solved. Include various mathematical symbols, like multiplication and division, randomly scattered around. Make sure there's no text present in the image, only numerical and symbolic representations.

Find the GCF of 20x − 4 .

The GCF of 20x - 4 can be found by factoring the expression.

20x - 4 = 4(5x - 1)

The GCF is 4.