Factor
2\left(-21x+6y-2\right)
Evaluate
-42x+12y-4
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2\left(-21x+6y-2\right)
Factor out 2.
gcf(-42,12,-4)=2
Find the greatest common factor of the coefficients.
2\left(-21x+6y-2\right)
Factor out 2.
-42x+12y-4
The opposite of -12y is 12y.
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