Question

решите плиз!!!
1,9-1,5z=0,1-0,5z

Answer 1

-1.5z+0.5=-1.9+0.1
-z=-1.8
z=1.8

Answer 2

1,9-1,5z=0.1-0.5z
-1.5z+0.5z=0.1-1.9
-1z=-1.8
z=1.8
Проверка : 
1,9-1,5*1,8=0,1-0,5*1,8
         -0,8=-0,8