(2 2/3х+1 3/7х)*21=58
8/3х+10/7х=58:21
86/21х=58/21
х=58/21:86/21
х=58/21*21/86
х=29/43
(2²₃х+1³₇х)×21=58
⁷²₂₁х=⁵⁸₂₁
х=⁵⁸₂₁:⁷²₂₁
х=⁵⁸₇₂=²⁹₃₆
