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x²+x=0
x(x+1)=0
x=0 ó x=-1
b)
y²-12y=0
y(y-12)=0
y=0 ó y=12
c)
3a²-4a=0
a(3a-4)=0
a=0 ó a=4/3
d)
4x²+12x=0
4x(x+3)=0
x=0 ó x=-3