Question

решите уравнения z-6.8=87+6.4 

10-v+4.3=10.7

6.2-y-1.8=4.39

Answer 1

1)z=87+6.8+6.4
z=100.2
2)-v=10.7-10-4.3
  -v=-3.6
 v=3.6
3)-y=4.39-6.2+1.8
-y=-0.1
y=0.1

Answer 2

а второе и третье ?