ta có: \(n+3=\frac{2n+6}{6}=\frac{8n+3}{2}=\frac{6n+18}{6}=\frac{2n+6}{6}=\frac{24n+9}{6}\)
\(\Rightarrow6n+18=2n+6=24n+9\)
\(\Rightarrow6n+18-2n-6-24n-9=0\)
6n -2n-24n + 18-6-9 = 0
n. ( 6-2-24) + ( 18-6-9) = 0
n.( -20) + 3 = 0
n . (-20) = -3
n = -3/ -20
n= 3/20
p/s nha!