REEMPLAZO EN LA FUNCION X1 Y X2 RESPECTIVAMENTE f(x1) = f(x2) x1 + 2 = x2 + 2 x1 = x2 + 2 -2 x1 = x2 FUNCION INYECTIVA
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I use this app called Photomath is really cool and it gives you the answer by just taking a picture and also it shows you how to do it, they have graphics and things like that
