4n - 1/7 = 5/7
4n/1 - 1/7 = 5/7
Lowest Common Denominator of 1, 7 is 7.
So LCD is 7.
Pardon me to just go ahead and solve the equation.
Multiply both sides of the equation by the LCD
7*(4n/1 - 1/7) = 7*(5/7)
28n - 1 = 5
28n = 5 + 1
28n = 6
n = 6/28
n = 3/14