-5*(0,8z-1,2)=-1z+7,2
-2x+16=5-19
25-3b=9-5b

-5*(0,8z-1,2)= -1z+7,2                  

-4Z + 6 = -Z +7.2

-4Z+ Z = 7.2 - 6

-3 Z = 1.2

Z = -0.4

25 - 3b =9 -5b

-3b +5b = 9 -25

2b = -16

b = 8