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ta=x-5xa
x-5xa=ta
x(1-5a)=ta//:(1-5a)
x=ta/1-5a
b) p = a + x + ax
a+x+ax=p/-a
x+ax=p-a
x(1+a)=p-a//:(1+a)
x=p-a/1+a
c)w = 1/x + p//*x
wx=1+px//-px
wx-px=1
x(w-p)=1//:(w-p)
x=1/w-p