5*0.8z - 5 * 1.2 = -z + 7.2
4z - 6 = -z + 7.2
5z = 13.2
z = 2.64
4z-6=-z+7,2
4z+z=7,2-6
5z=13,2
z=2,64
5*0.8z - 5 * 1.2 = -z + 7.2
4z - 6 = -z + 7.2
5z = 13.2
z = 2.64
4z-6=-z+7,2
4z+z=7,2-6
5z=13,2
z=2,64