The GCF is 4x.
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20x3-15x2=8,000-225=7,775
You split the current values into a common factor, in this case the greatest common factor (hence "GCF"). e.g. 24x + 144x = 12x (2 + 12)
The GCF of 12^2 + 18 - 36 is 6.
12x-17x = -5
12x - 2x = 10