book Maths Puzzle Numerical Ability

how could i find "x" in this problem? 9/(x-3) - (x-4)/(x-3) = 1/4

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book Other Question

36a^2b^3-45ab^4 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!