-4/x=3-x |*x
-4=3x-x^2
-x^2+3x+4=0
x^2-3x-4=0
D=9+16=25=5^2
x1=(3+5)/2=4
x2=(3-5)/2=-1
x = 4, -1
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-4/x=3-x |*x
-4=3x-x^2
-x^2+3x+4=0
x^2-3x-4=0
D=9+16=25=5^2
x1=(3+5)/2=4
x2=(3-5)/2=-1
x = 4, -1