(2(y+x)+2(y-x)+76) /(y+x) =76/x (2y+2x+2y-2x+76)/(y+x) =76/x (4y+76)/(y+x) =76/x (4y +76)*x =76*(y +x), 4(y +19)*x =76*(y +x); :4 (y +19)*x =19*(y +x) xy +19x =19y +19x xy +19x -19y -19x =0 xy -19y =0 xy =19y x =19y/y x =19 ответ: x =19