book Maths Puzzle Numerical Ability

I have a math exam tomorrow and i can not figure out this problem!! can you help? (it is not from a text book. . . she made our review up)
Log(6)5= Log(6)(2x+1)- log(6)(3x+4)
* the parenthesis are the bases!

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book Other Question

how could i find "x" in this problem? 9/(x-3) - (x-4)/(x-3) = 1/4 If f(x)= a0+a1x+a2x^2+a3x^3+---------+a10x^10,where a0,a1,-----a10 are constants ,then the sum of coefficients of terms having even powers of x can be expressed as
(1) {f(2)+f(-2)}/2
(2) {f(2)-f(-1)}/2
(3) {f(1)-f(-1)}/2
(4) {f(1)+f(-1)}/2