Question

Tìm X (X.7+15).23=391

Answer 1

=>7x+15=391/23=17

=>7x=2

=>x=2/7

Answer 2

\(\left(x.7+15\right).23=391\) 

 \(x.7+15=\dfrac{391}{23}\) 

\(x.7+15=17\) 

\(x.7=17-15\) 

\(x.7=2\)

   \(x=\dfrac{2}{7}\)