Помогите, чем сможете, пожалуйста
Решите систему уравнений:
1)
5x + y = 30
3x - 4y = 41

2)
3u - 4v = 2
9u - 5v = 7

3)
5y + 8z = 81
10y - 3z = -15

4)
2x + 3z = 6
3x + 5z = 8

5)
2m + 5n = 12
4m + 3n = 10

6)
8x - 3y = 22
3x + 4y = -2
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