44.
72-х=18*3
72-х=54
х=72-54
х=18
х:8=130+270
х:8=400
х=400*8
х=3200
400:х=1000:10
400:х=100
х=400:100
х=4
х-290=470+230
х-290=700
х=700+290
х=990
х+320=90*8
х+320=720
х=720-320
х=400
15*х=630:7
15*х=90
х=90:15
х=6
45.
156-96:(12:4):2=156-96:3:2=156-96:3:2=156-32:2=156-16=140
156-96:12:(4:2)=156-96:12:2=156-8:2=156-4=152
(156-96:12):(4:2)=(156-8):2=148:2=74
4689*5+97308=23445+97308=120753
90000-6*2509=90000-15054=74946
76090*4-5673=304360-5673=298687
1485:5*4=297*4=1188
2496:8*7=312*7=2184
9999:9*8=1111*8=8888