book Maths Puzzle Numerical Ability

Hi I am having trouble with this question. Can you help?

9^(4x-3)=4^(2x-4)

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book Other Question

Expand using the rules of logarithms.

log (x^2 y^3 Square root z-1)
log a over 3 Square root BC
log (t^2 * 4 Square root tp^3) what is the equation of the line passing through (0,15) perpendicular to the graph of y=-3/4x+2/3???

thanks.