-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
-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