7x - 2x = 569 - 567
=> 5x = 567.(52 - 1)
=> 5x = 567 . 24
=> x = 567 . 24 : 5
=> x = 566 . 24
Vậy x = 566 . 24
7x-2x=569-567
=> (7x - 2x ) -( 569 - 567) =0
Mik chỉ giúp đc ý này thôi
\(7x-2x=5^{69}-5^{67}\)
\(5x=5^{67}\left(5^2-1\right)\)
\(\Rightarrow x=5^{66}\left(5^2-1\right)\)
\(x=5^{66}.24\)
Vậy...