a-80=320+350 590-X=110+260a-80=670 590-X=370a=670+80 X=590-370a=750 X=220750-80=320+350 590-220=110+260670=670 370=370 X+120=900-540 480+b=960-150X+120=360 480+b=810X=360-120 b=810-480X=240 b=330240+120=900-540480+330=960-150360=360 810=810
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a-80=320+350 590-X=110+260a-80=670 590-X=370a=670+80 X=590-370a=750 X=220750-80=320+350 590-220=110+260670=670 370=370 X+120=900-540 480+b=960-150X+120=360 480+b=810X=360-120 b=810-480X=240 b=330240+120=900-540480+330=960-150360=360 810=810