40 -4,9x = 4,72 ,(z - 1.2): 0.4=2.7 3.5p-p=9.8 (12.4-s): 4.99=0.75 8k - 7,95k k = 0,6585

40 -4,9x = 4,72
-4,9x=-35,28
x=7,2

(z - 1.2):0.4=2.7
1,08=z-1,2
x=2,28

3.5p-p=9.8
2,5p=9,8
p=3,92

(12.4-s):4.99=0.75
3,7425=12,4-s
s=8,6575

 8k - 7,95k=8*0,6585-7,95*0,6585=5,268-5,235=0,033