To solve this, first we have to substract 4 in both sides of the equation:
[tex]\frac{5}{7}x+4-4=8-4[/tex]And now we have
[tex]\frac{5}{7}x=4[/tex]And now we multiply by 7/5 both sides (or divide by 5/7, it's the same in other words)
[tex]\frac{5}{7}\cdot\frac{7}{5}x=4\frac{7}{5}[/tex]Then we have:
[tex]x=\frac{28}{5}=5.6[/tex]The answer is x = 5.6
