3(180-х+(80-х))=х+х
3(180-х+80-х)=2х
3(260-2х)=2х
780-6х=2х
-6х-2х=780
-8х=780|÷-8
х=-97.5
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3(180-х+(80-х))=х+х
3(180-х+80-х)=2х
3(260-2х)=2х
780-6х=2х
-6х-2х=780
-8х=780|÷-8
х=-97.5