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x. 7. =7x
x. 3. =3x
10x.
x+7=0. x+3=0
x= -7. x= -3
x2-8x-20=0
x. -10. =-10x
x. 2. =2x
-8x
x-10=0. x+2=0
x=10. x=-2
factorizamos
=0
por lo tanto los valores de x son -7,-3