Решите систему уравнений 1. 4 (х-у) = -2
3х-7у = - 2,5 - 2(х+у)

2. 2- 3х = 2(1-у)
4(х+у) = х - 1,5

3. х/2 + у/3 = 3
х/3 + у/2 = 1/3
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