а) 2x-(20x+4)+7=3, x=0;
б) x+7x-3=-11, x=-1;
в) 2(x+5)-1=8, x=-½.
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Answers & Comments
а) 2x-(20x+4)+7=3, x=0;
б) x+7x-3=-11, x=-1;
в) 2(x+5)-1=8, x=-½.