i would like to make FH4, FH3, FH2, FH1 the same value. only by changing alpha.
?????
Which one of the four alpha?
If you mean that you want to chose a value for alpha1 and then solve a system of equations for alpha2 .. 4 using a solve block so that these values are all equal, you have to turn the variables into functions of the appropriate alpha values first.
