three
four
(2)
a= 12
b=5
This is the fourth equation.
(3)
Equation:
(2n+4)/x- 1/(x-n- 1)= 1
Its root is x 1=n+2.
x2=2n+2
Verification: x 1 has been replaced.
(2n+4)/(n+2)- 1/ 1 = 2- 1 = 1
X2 substitution
(2n+4)/(2n+2)- 1/(n+ 1)=(n+ 1)/(n+ 1)= 1