рівняння
1)-4х = 28;
2)-1,4x = -5,6;
3)1/3x = -2/9
4) 7x +3 =30-2x
5)7-2x = 3x -18
6)3(x-2) = x +2
7)(7x +1) - (9x+3) = 5
8)3x+6=2(2x - 7) - x
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