СРОЧНО ПОЖАЛУЙСТА решите уравнение
1) 2x = 18-x;
2) 7x-3 = 30-2x;
3) 3(x-2)=x+2;
4),5-a(x-1) = 4-x;
5) (7x-1)-(9x+3)=57
6) 3,4+2y=4(y-4,3),
7).0,2(4-7y) = 2,3-0,3(y-6);
8). 1x-31-2;
9) 1X-4/=0
10) 1x1 + 1 = 4
11) 2/x/+3=0
12)||3x|+21-4=0
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