a-80=320+350
a-80=670
a=670+80
a=750
590-x=110+260
590-x=370
-x=370-590
-x=-220
x=220
x+120=900-15
x+120=885
x=885-120
x=765
480+b=960-150
480+b=810
b=810-480
b=330
a-80=320+350
a-80=670
a=670+80
a=750
590-x=110+260
590-x=370
-x=370-590
-x=-220
x=220
x+120=900-15
x+120=885
x=885-120
x=765
480+b=960-150
480+b=810
b=810-480
b=330