(-20a+12ab+18ac):(-2a)=10-6b-9c
(4,8b-0,6bc-1,5bd):(0,3b)=16-2c-5d
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(-20a+12ab+18ac):(-2a)=10-6b-9c
(4,8b-0,6bc-1,5bd):(0,3b)=16-2c-5d