exam Maths Puzzle Numerical Ability

i need to find the value of x here and i really need your help... i need the answer today before 6-9 in the morning... thanks...
(4^(x-1))*(3^(x+2))=12^4

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exam Other Question

One number is 6 less than another number. Their sum is 20. Find the greater number? A bookcase with three shelves is built by a student. If the height of the bookcase is to be 2 ft longer that the length of a shelf and the total amount of wood to be used is 32ft,