11. Решите уравнения:
1)12 1/3 * (1/5 * x - 1 1/6) = 8 2/9
2)1 3/23 * (8 2/3 - 3/4 * x) = 4 5/23
3) ((5/6 * x - 1/3) - 1/2) * 2 1/2 = 1 1/2
4)3/5 * ((2x + 1 3/4) - 7 1/2) = 2​
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