1/3(1/2z+191/2)=(2/7/9+3/1/3)3/5
1/3*(1/2z+191/2)=(2 7/9+3 1/3)*3/5 1/3*(1/2z+191/2)=(5 7/9+3/9)*3/5 1/3*(1/2z+191/2)=6 1/9*3/5 1/3*(1/2z+191/2)=11/3 1/2z+191/2=11/3÷1/3 192/2z=11 z=11÷96/1 z=11/1056 z=1/96