Let be the equilibrium plasma pressure profile.
The equilibrium force balance relation (see Section 2.25)

(14.30) 
gives

(14.31) 
where use has been made of Equations (14.5) and (14.7).
The previous equation reduces to the GradShafranov equation [19,26,32],

(14.32) 
where use has been made of Equations (14.20), (14.21), (14.28), and (14.29). The GradShafranov
equation can be written in the alternative form

(14.33) 
where
,
,
, and
.