(0,4ab-0,5bc+0,1cd)-(-0,3ab+2,5bc-cd)=
0,4ab-0,5bc+0,1cd+0,3ab-2,5bc+cd=
=0,7ab- 3bc 1,1cd
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0,4ab-0,5bc+0,1cd+0,3ab-2,5bc+cd=
=0,7ab- 3bc 1,1cd