1227. Решите уравнение:
И) (7х + 3) — (5х – 7) = (2x – 5) - (3х – 6);
2) 3(2x – 3) + 4(2 – 5x) = 7(2 – 3х) – 2(3х – 1);
3) (x - 1,6) + 0,75 (5 x +15) = 5 - 3x;
4) 2 (3,5х – 4) - 3 (3х + 1) = 25 ( x = 1,4).​
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