решите уравнения
1. 9(х-1) = х+15
2. 12-4 (х-3) = 39-9х
3. (11х+14) - (5х-8) = 25
4. 2(3х+5) - (4х-1) = 121
5. 3х = 28-х
6. 2х+9 = 2х - 4

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