4=-x^2-4x
x(x+2)-2(x+2)=0
-(x+2)(x+2)=0
-(x+2)^2=0
x+2=0
x=-2
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4=-x^2-4x
x(x+2)-2(x+2)=0
-(x+2)(x+2)=0
-(x+2)^2=0
x+2=0
x=-2