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Dziedzina: X∈R- {2},
5/(x-2) - (7-x)/(x-2) = -3
(5-7+x)/(x-2)=-3 //*(x-2)
-2+x= -3*(x-2)
-2+x=-3x+6
4x=8
x=2, x∉D
b) Dziedzina: X∈R-{-3}
(2x-9)/(x+3)=x-3 //*(x+3)
2x-9=(x-3)*(x+3)
2x-9=x^2-9
x^2-2x=0
x*(x-2)=0
X1=0 v X2=2