Question

x + 3 và 1/5 = 4 

( x - 2/3 ) x 3 = 3/4

Answer 1

\(x+3\dfrac{1}{5}=4\)

\(x+\dfrac{16}{5}=4\)

         \(x=4-\dfrac{16}{5}\)

         \(x=\dfrac{4}{5}\)

\(\left(x-\dfrac{2}{3}\right)\times3=\dfrac{3}{4}\)

       \(\left(x-\dfrac{2}{3}\right)=\dfrac{3}{4}:3\)

             \(x-\dfrac{2}{3}=\dfrac{1}{4}\)

                     \(x=\dfrac{1}{4}+\dfrac{2}{3}\)

                     \(x=\dfrac{11}{12}\)

Answer 2

     \(x+3\dfrac{1}{5}=4\)
=> \(x+\dfrac{16}{5}=4\)
     \(x\)           \(=4-\dfrac{16}{5}\)
     \(x\)           \(=\dfrac{20}{5}-\dfrac{16}{5}\)
     \(x\)           \(=\dfrac{4}{5}\)

\(\left(x-\dfrac{2}{3}\right) . 3=\dfrac{3}{4}\)
\(\left(x-\dfrac{2}{3}\right)\)     \(=\dfrac{3}{4} : 3\)
\(\left(x-\dfrac{2}{3}\right)\)     \(=\dfrac{3}{4} : \dfrac{3}{1}\)
\(\left(x-\dfrac{2}{3}\right)\)     \(=\dfrac{1}{4}\)
  \(x\)                \(=\dfrac{1}{4}+\dfrac{2}{3}\)
  \(x\)                \(=\dfrac{11}{12}\)