z-7/z+1=3/5
assuming you meant
(z-7)/(z+1) = 3/5
then we clear fractions and get
(z-7)(5) = (3)(z+1)
5z-35 = 3z+3
2z = 38
z = 19
check:
12/20 = 3/5
(z-7)/(z+1) = 3/5
then we clear fractions and get
(z-7)(5) = (3)(z+1)
5z-35 = 3z+3
2z = 38
z = 19
check:
12/20 = 3/5