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ta=x-5ax
ta=x(1-5a) / :(1-5a)
ta/(1-5a)=x
p=a+x+ax
p-a=x(1+a) /:(1+a)
(p-a)/(1+a)=x
m=(x+1)p-3x
m=xp+p-3x
m-p=x(p-3) /:(p-3)
(m-p)/(p-3) =x
w=1/x+p /*x
wx=1+px
wx-px=1
(w-p)x=1 /:(w-p)
x=1/(w-p)