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(x+1)(x+2) = (x-1)(x-2)
x^2+2x+ x+ 2 = x^2- 2x-x +2
x^2 + 3x +2 = x^2 -3x +2
x^2-x^2 + 3x+3x= 2-2
6x = 0
x= 0/6
x= 0
R: cuando x tiene el valor de 0 ambas expresiones son iguales