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3 pangkat x = y
y^2 - 5y - 36 = 0
(y+4)(y-9)=0
y=-4 dan y=9
y= -4
3 pangkat x = -4
^3 Log (-4) = x ---> didalam log tidak boleh ada negatif
y= 9
3 pangkat x = 9
^3 Log 9 = x
x=2