Обведённое на фотке уравнение)

(2 7/9z + 3 1/3)*3/5=1/6z+6 1/2

(25/9z+10/3)*3/5=1/6z+13/2

75/45z+30/15=1/6z+13/2

75/45z+1/6z=2+13/2=8 1/2

z(75/45+1/6)=8 1/2

z(15/9+1/6)=8 1/2

z(30/18+3/18)=8 1/2

33/18* z = 8 1/2

z=17/2 : 33/18

z=17/2 * 18/33 = 306/66=51/11= 4  7/11

75/45z+30/15=1/6z+13/2

5/3z-1/6z=13/2-2/1

3/2z=9/2

Z=9/2÷3/2

Z=9/2×2/3

Z=3

7=7