Решите пожалуйста уравнения!!! ( 2 и 3 срочно, а 1 можете не решать)
1. ( х-1) : 3 = ( 20 - 2х) : 3
2. 15* ( е+ 2) : 7 = 6 * (2е + 7) : 7
3. 5 * ( с + 3) : 6 = 8 * (10 - с) : 6
Спасибо!!!!
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