book Maths Puzzle Numerical Ability

how do you solve equations that have different logs: log5(x-4) = log7x, solve for x
The 5 and the 7 are little

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2/5 - y/y-2

Thanks!
Passes through (8,3) is perpandicular to y=4x+11

a) y=-4x+35
b) y=4x-29
c) y=-1/4x+5
d) y=1/4x+1