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= 3m² - 9m - 2m² + 2m + 2m² - 2m
= 3m² - 2m² + 2m² - 9m + 2m - 2m
= 3m² - 9m
c. = -3d (2d - 7) + d(5d + 2) + 4d
= -6d² + 21d + 5d² + 2d + 4d
= -6d² + 5d² + 21d + 2d + 4d
= -d² + 27d
maaf yg A gk bisa maaf juga klo jwabannya slah :)