Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$A-B+D=3; A-B-D=1; a+b+c=0; a-6+d=3; a+6-c=0; a-b-a=1$$

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