book Maths Puzzle Numerical Ability

Solve: 3^x * 9^-x =27^x

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I have tried to work this problem and I am confused.

An employment agency specializing in temporary construction help pays heavy equipment operators $129 per day and general lab
Now this is a challenge for me. the question reads, write an equation in slope-intercept form of the line that passes through a given point and is perpendicular to the graph of each equation. problem #33 is (6, -13), 2x - 9y = 5