ПОЖЖАЛУЙСТА ПОМОГИТЕ РЕШИТЬ УРАВНЕНИЕ ДАЮ 20 БАЛЛОВ: 1)-8×(3х-2)+5×(5х-3)=0; 2)5х+6-(3х-4)=х-3-(2х-4); 3)3х-7=2х+3; 4)21-9х=24-12х.
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