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4a-a-2b-4b+4c-2c+d+2d sumamos o retamos términos semejantes
3a -6b +2c + 3d
4a-2b+4c+d-a-4b-2c+2d
4a-a=3a
-2b-4b=-6b
4c-2c=2c
d+2d=3d
y los ordenas: 3a-6b+2c+3d