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-5f - (-2f) = -5f + 2f = -3f
-9h - (-3h) = -9h + 3h = -6h
jadi, jawabannya 6e - 3f -6h yang A
= 2e-2f+3h-8e+5f+9h
= -6e+3f+12h (jawabannya C)