Раскройте скобки и приведите подобные слагаемые 
1) 9(7х-6)-18х
2)7а-6(19-а)
3)0,8(6х-2)+1,6(х-4)
4)2,8(5b-6c)-(7b-8a)×1,2
5)-(-4,9-5,8z)-(3,1z-5,6)
6)8/15(
2целых 1/4a - 7 целых 1/2b)-7/30(4 целых 2/7а - восем целых 4/7b)
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