Решите уравнение: х^2-4/х+2=0, 4-5 у/у+5-1+5 у/5-у=7/у^2-25

1) (x² - 4) / (x+2) = 0

(x-2) (x+2) / (x+2) = 0

x-2 = 0

x = 2

2) (4-5y) / (y+5) - (1+5y) / (5-y) = 7 / (y-5) (y+5)

((4-5y) (5-y) - (1+5y) (y+5)) / (y+5) (5-y) = 7 / (y-5) (y+5)

(20-29y+5y² - (5+5y²+26y)) / - (y+5) (y-5) = 7 / (y - 5) (y+5)

(20-29y+5y²-5-5y²-26y) / - (y-5) (y+5) = 7 / (y-5) (y+5)

- (15-55y) / (y-5) (y+5) = 7 / (y - 5) (y+5)

(-15+55y - 7) / (y-5) (y+5) = 0

55y - 22 = 0

55y = 22

y = 22/55

y = 2/5

y = 0.4