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Which of these expressions CANNOT be simplified by combining like terms? CLEAR CHECK 6fg3+4−4f2g2+f3g−126fg3+4-4f2g2+f3g-12 6fg3+2f(2fg)+4f2g−106fg3+2f(2fg)+4f2g-10 6fg3+5f2g2+f3g−76fg3+5f2g2+
Which of these expressions CANNOT be simplified by combining like terms?
CLEAR CHECK
6fg3+4−4f2g2+f3g−126fg3+4-4f2g2+f3g-12
6fg3+2f(2fg)+4f2g−106fg3+2f(2fg)+4f2g-10
6fg3+5f2g2+f3g−76fg3+5f2g2+f3g-7
6f3g3+7f2g2+4f3g3−10fg