Question

Х•(72-18)-12=312

48+х•(72:2)=156

Answer 1

х*(72-18)-12=312
х*54-12=312
х*54=312+12
х*54=324
х=324:54
x=6
48+x*(72:2)=156
48+x*36=156
x*36=156-48
x*36=108
x=108:36
x=3