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(x-3) (x+3) = (x-3)*2
x*2 - 3*2 = x*2 - 2(3x) + 3*2
x*2 - 9 =x*2 - 6x + 9
x*2 -x*2 + 6x = +9+9
6x = 18
x= 18/6
x= 3
Espero haberte ayudado, suerte y gracias c: