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9/x = x/4 ==> multiplicamos en cruz
36=x²==>aplicamos raiz cuadrada a ambos terminos
√36=√x²
x=6
x=-6
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solucion 2
m/9 = 1/9==>invertimos las fracciones es decir a/b = b/a
9/m = 9
9=9×m
9/9=m
m=1
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solucion 2
25/y = y/4==>multiplicamos en cruz
100=y²==>aplicamos raiz cuadrad
√100=√y²
y=10
y=-10
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solucion 4
16/n = n/4
64=n²
√64=√n
n=8
n=-8
saludos