11x/11 = 37.62/11

x = 3.42

б)

1.2*(5.4-x) = 4.32

6.48 - 1.2x = 4.32

6.48 - 1.2x + 1.2x = 4.32 + 1.2x

2.16 = 1.2x

x = 1.8