Раскройте скобки и выражении и приведите подобные члены:
а) -(3,7а-4,2b)-(5,2a-5,8b)
б) (2m-4,8n) - (2m+3,2m-6)
е) 14-(5,2a-8,5)-(4,8a-6,5)
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