7(x+5^2)-20=190
7(x+25)-20=190
7(x+25) =190+20
7(x+25) =210
x+25 =210/7
x+25 =30
x =30-5
x =5
Vậy x=5
\(7\left(x+5^2\right)-20=190\)
\(7\left(x+25\right)=190+20\)
\(7\left(x+25\right)=210\)
\(x+25=210:7\)
\(x+25=30\)
\(x=30-25\)
\(x=5\)
Vậy x=5
7.(x + 52) - 20 = 190
7.(x + 25) = 190 + 20
7.(x + 25) = 210
x + 25 = 210 : 7
x + 25 = 30
x = 30 - 25 = 5
Vậy x = 5
Ủng hộ mk nha !!! ^_^