Решение уравнения х*15,2=9,12; 19,83+х=138,16; х-54,81=19,98; х: 7,8=15,2.

Х*15.2=9.12

х=9.12:15.2

х=0.6

0.6*15.2=9.12

19.83+х=138.16

х=138.16-19.83

х=118.33

19.83+118.33=138.16

х-54.81=19.98

х=19.98+54.81

х=74.79

74.79-54.81=19.98

х: 7.8=15.2

х = 15.2*7.8

х=118.56

118.56:7.8=15.2