Помогите решить!!!!!! Пожалуйста!!!!!
Упростите: 6+4а-5а+а-7а
5(n-2)-6(n+3)-(2n-9)
5/7(2,8c-4целых 1/5d)-2,4(5/6c-1,5d)
Упростите поняно))))))))))))
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