D=R\{-9}, bo x+9 != 0 => x != -9
4/(x+9)=-5 //*(x+9)
4=-5(x+9)
4=-5x-45 //+5x //-4
5x=-49 //:5
x=-9 4/5
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D=R\{-9}, bo x+9 != 0 => x != -9
4/(x+9)=-5 //*(x+9)
4=-5(x+9)
4=-5x-45 //+5x //-4
5x=-49 //:5
x=-9 4/5