Упростите выражения
а)6+4a-5a+a-7a
б)5(n-2)-6(n+3)-3(2n-9)
в)5/7(2,8c-4 1/5 d)-2,4(5/6c-1,5d)
ДАЮ 70 БАЛЛОВ!!!ПОМОГИТЕ!!!!
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