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tx=a-5x^2
5x^2+tx=a
x(5x+t)=a
x=a/(5x+t)
b)p=a+x+ax
p-a=x+ax
p-a=x(1+a)
(p-a)/(1+a)=x
c) m=(x-1)p-3x
m=px-p-3x
m+p=px-3x
m+p=x(p-3)
(m+p)/(p-3)=x
d)w=1/x + p
wx=1+px
wx-px=1
x(w-p)=1
x=1/(w-p)
ale nie jestem pewna co do przykładu A