5^2x-3-2*5^2=5^2*3
5^2x-3-2*5^2=25*3
5^2x-3-2*5^2=75
5^2x-3-2*25=75
5^2x=75/25+2+3
5^2x=8
5^2x=2^3
khúc đậy chịu
52x-3 - 2.52 = 52 .3
52x-3 - 2.25 = 25 .3
52x-3 - 50 = 75
52x-3 = 75 + 50
52x-3 = 125
52x-3 = 53
=> 2x-3 = 3
2x = 3+3
2x = 6
x = 6 : 2
x = 3
Vậy x bằng 3