exam Maths Puzzle Numerical Ability

Hi I am having problems with this: Solve the following equation:

3x</sup> = 15�4x-2</sup></PRE>

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How do I solve using a system of equations in two variables?

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers i 21. Find the numbers. Given that tan(θ)=3/4 and θE(π,3π/2); find the values of the remaining five trigonometric functions of θ