Question 902682
1/a+1/b=1/x
1/a+1/(a+1)=1/72
(a+1+a)/(a*(a+1))
2a+1/(a^2+a)=1/72
72*(2a+1)=a^2+a
144a+72=a^2+a
a^2-143a-72=0


*[invoke quadratic "a", 1, -143, -72]
a=143.50 a+1=144.50