1)3x + 5/9=10(15/27
2)2(1/4)x+3(3/4)=7
3)2/3+2(1/5)*x=5(1/2)

Попробуй сюда в комментарий картинку загрузить.

1) 3x + 5/9 = 10(15/27)

3x = 10(15/27) - 5/9 = 285/27 - 15/27 = 270/27 = 10

3x = 10

x = 10/3 = 3(1/3)

x = 3(1/3)

2) 2(1/4)x + 3(3/4) = 7

2(1/4)x = 7 - 3(3/4) = 28/4 - 15/4 = 13/4 = 3(1/4)

x = 3(1/4) : 2(1/4) = 13/4 * 4/9 = 52/36 = 1(16/36)

x = 1(16/36)

3) 2/3 + 2(1/5)*x = 5(1/2)

2(1/5)*x = 5(1/2) - 2/3 = 33/6 - 4/6 = 29/6 = 4(5/6)

x = 4(5/6) : 2(1/5) = 29/6 * 5/11 = 145/66 = 2(13/66)