Решить уравнения: 1) 0.87x-0.9x+1.3x= -3.4 
2) 3/7(0.56-4.9y)-6/13(0.52-3.9y)=0.6 
3) 0.37x-8.62=0.38x03.59 
Пожалуйста 40 балов ваши
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