\(3x:9=3\)
\(\Rightarrow x=\frac{3\cdot9}{3}\)
\(\Rightarrow x=9\)
Vậy x = 9
\(3x\div9=3\)
\(\Rightarrow3x=3\times9\)
\(\Rightarrow3x=27\)
\(\Rightarrow x=27\div3\)
\(\Rightarrow x=9\)
3x:9=3
x =3\(\times\)9
x=3\(\times\)9/3
\(\Rightarrow\)x=9
vậy x=9