Домножаем все уравнение на 1(1/7):
10(1/7) - y + 2(5/8)*1(1/7) = 7(1/8)*1(1/7)
y = 10(1/7) + 2(5/8)*1(1/7) - 7(1/8)*1(1/7)
2(5/8)*1(1/7) = (21*8)/(8*7)=3
7(1/8)*1(1/7) = (57*8)/(8*7)=57/7 = 8(1/7)
y = 10(1/7) + 3 - 8(1/7)=5
10 1/7 - у = 4
у = 6 1/7
Домножаем все уравнение на 1(1/7):
10(1/7) - y + 2(5/8)*1(1/7) = 7(1/8)*1(1/7)
y = 10(1/7) + 2(5/8)*1(1/7) - 7(1/8)*1(1/7)
2(5/8)*1(1/7) = (21*8)/(8*7)=3
7(1/8)*1(1/7) = (57*8)/(8*7)=57/7 = 8(1/7)
y = 10(1/7) + 3 - 8(1/7)=5