Решите систему линейных уравнений с двумя переменными 1) 3x-2y=7
2x=2y=8

2) 7x-0,7y=-5
4x-0,4y=10

3) 5x-0,6y=60
2x-0,3y=-36

4) -5x+7y=15
3x- 4y=13
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