Докажите тождество:
(5a-3b)-(4+5a-3b)=-4
(3m-7)*0,6-0,8(4m-5)-(-1,7-1,4m)=1,5
7a(3b+4c)-3a(b+1/3c)=9a(2b+3c)
Помогите пожалуйста!!
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