exam Maths Puzzle Numerical Ability

i cannot seem to be able to find the following answer for x. i nead the exact answer. the question is (lnx^9)*(lnx)-lnx^2-7=0

Please help
regards mr hopkins

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Does every infinite set has the same cardinality (number of elements). Find the slope-intercept from the equation of the line passing through the points (2,-4) and (4,6)