Ответ:
640-(x+260)=50;
640-x-260=50;
380-x=50;
-x=50-380;
-x=-330;
x=330.
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Ответ:
640-(x+260)=50;
640-x-260=50;
380-x=50;
-x=50-380;
-x=-330;
x=330.