Х = 58/86
Х = 29/43
Пошаговое объяснение:
( 2 2/3х + 1 3/7х ) • 21 = 58
2 2/3 + 1 3/7 = 2 14/21 + 1 9/21 = 3 23/21 = 4 2/21
( 4 2/21 )Х • 21 = 58
( 86/21 )Х = 58/21
86х = 58
