-42m3+18n3
Factor -6 out of -42m3.
-6(7m3)+18n3
Factor -6 out of 18n3.
-6(7m3)-6(-3n3)
Factor -6 out of -6(7m3)-6(-3n3).
-6(7m3-3n3)
Factor -42m^3+18n^3
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