book Maths Puzzle Numerical Ability

express as a single logarithm

log(x^2+2x-3/x^2-4)-log(x^2+7x+6/x+2)

Thank you so much for all your help.

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book Other Question

Use a system of equations to solve the following:

The sum of two numbers is 54. The difference of the two numbers is 18. Find the two numbers.
solve the equation graphically if possible.
x=4+y
y=3+x
thank you
kayla