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2x/2=1-2
2x=(1-2)*2
2x= (-1)*2
2x= -2
x= -2/2
x= -1
la expresión 2x/2 = x*2/2 = x*1 = x, entonces la ecuación queda así:
x = 1-4/2
x = 1-2
x = -1
El valor de x es -1
Veamos si cumple:
2*-1/2 = 1-4/2
-1 = 1-2
-1 = -1 comprobado.
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