Question

3(5z_7)_2(9z_11)=4(8z_13)_7

Answer 1

3 (5z-7)-2 (9z-11)=4 (8z-13)-7

15z-21-18z+22=32z-52-7

-3z+1=32z-59

-3z-32z=-59-1

-35z=-60

35z=60

z=60/35

z=12/7