Question

1/5.x + 2/5.x = x - 4

giải giúp mk nhé!!!!!!!!!!!!!

Answer 1

\(\frac{1}{5}x+\frac{2}{5}x=x-4\)

             \(\frac{3}{5}x=x-4\) 

     \(\frac{3}{5}x-x=-4\)

         \(-\frac{2}{5}x=-4\)

                  \(x=10\)

Answer 2

\(\frac{1}{5}x+\frac{2}{5}x\)= x - 4

\(\frac{3}{5}x\)= x - 4 

\(\frac{3}{5}x\)- x = - 4 

\(\frac{-2}{5}x\)= -4

x = -4 : \(\frac{-2}{5}\)

x = 10