a-80=320+350
a-80=670
a=670+80
a=750
750-80=320+350
a=750;
590-x=110+260
590-x=370
x=590-370
x=220;
x+120=900-540
x+120=360
x=360-120
x=240;
480+b=960-150
480+b=810
b=810-480
b=330
a-80=320+350
a-80=670
a=670+80
a=750
750-80=320+350
a-80=320+350
a-80=670
a=670+80
a=750;
590-x=110+260
590-x=370
x=590-370
x=220;
x+120=900-540
x+120=360
x=360-120
x=240;
480+b=960-150
480+b=810
b=810-480
b=330