Решите уравнения с комментированием:
1) (2х + 7х) : 5 = 27;                             3) 26 * (7у + 5 + 3) = 1300;
2) (8у у 12у) : 14 = 30;                         4) 640 : (5к + 4 + 7к) = 16.
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