1)0,5x+3=0,2x
2)-0,4a-14=0,3a
3)4,7-8z=4,9-10z

1)0.5x + 3 = 0.2x0.3x = -3x = -102)-0.4a - 14 = 0.3a-0.7a = 14a = -203)4.7 - 8z = 4.9 - 10z2z = 0.2 z = 0.1