х+(х-80)+(х+(х-80))*2+140=980
2х-80+2х+2х-160+140=980
6х=980+80+160-140
6х=1080
х=1080:6
х=180
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х+(х-80)+(х+(х-80))*2+140=980
2х-80+2х+2х-160+140=980
6х=980+80+160-140
6х=1080
х=1080:6
х=180