a)5a+17a=22a
б)12b-4b=8b
в)39c+18c=57c
г)768d-342d=426d
д)75k-11k=64k
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a)5a+17a=22a
б)12b-4b=8b
в)39c+18c=57c
г)768d-342d=426d
д)75k-11k=64k