343. Розв'яжіть рівняння:
1) 10 - (7 - 4x-x) = x + 8x - 9;
2) (5х-3)-(2х + 5) = 5x";
3) 6 + х - (2x - 9 + х) = 5;
4) 12-(6-9x-x) = x + bx -14.​
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