Terme zusammenfassen 4

3k+2k+2a+k-a+3k+3k+2a =
-a+3a+2a+3d+2d+2a+a-2a =
f+2e-3f+2e+3e+3f+3e-f =
2d+e-e-3e+2d+d-e+2e =
3f-n+3n-f+3n-3f-3n-3n =
e-2e+2e+2e-a-3e+3e-2e =
-j-f+3f+2j+3j+3j+f-2f =
-c-3c-3a-c-2a-3c+2c+2a =
-i-2e+e+3i+3e-2i-3e+3e =
-2f+d-3f-2f+f+3f+2d+f =
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