Это очень легко. Решите???хпхп.Даю 30балов

1   40+(-z) = 0

40 - z =0

z=40

3. (-z) - 50.2 = 0

-z - 50.2 =0

z=-50.2

5. -39 - (- z) = 0

-39 + z = 0

z=39

7. -(-z)-2.22 =0

z - 2.22=0

z=2.22

2. 8.6 - (-z) =0

8.6 + z = 0

z=-8.6

4. -67 + (-z) = 0

-67 - z = 0

z = -67

6. -(-z) + 100 =0

z + 100 = 0

z=-100

8. -555 + (-z) = 0

-555 - z = 0

z=-555