\(4x+28:4=40:4\)
\(\Rightarrow4x+7=10\)
\(\Rightarrow4x=10-7\)
\(\Rightarrow4x=3\)
\(\Rightarrow x=\dfrac{3}{4}\)
x.4+28:4=40:4
x.4+28:4=10
x.4+28=10.4
x.4+28=40
x.4=40-28
x.4=12
x=12:4
x=3
=>x.4+7=10
=>x.4 =10-7
=>x.4 =3
=>x =3:4
=>x=3/4