5x-20=3x
5x-3x=20
2x=20
x=20:2
x=10
Vậy x=10.
5x-20=3x
5x-3x=20
2x=20
x=20:2
x=10
➤ x=10
\(5x-20=3x\)
\(5x-20=5\left(x-4\right)\)
\(5\left(x-4\right)=3x\)
\(2x=20\)
\(\Rightarrow x=10\)
5x-20=3x
5x-3x=20
x(5-3)=20
2x=20
x=20:2
x=10