1) 4x+5 меньше или = 21; 2) 9x-7 больше -25;
3) 4x+2 больше 3x+1;
4) 6x+1 меньше 2x+9;
5) 10/x-4=2;
6) 6-5y/2=-4.5;
7)2y+1/3=5;
8)6.2/3y+1=2.
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