exam Maths Puzzle Numerical Ability

What is the process to solve x - 2x = 15 ? Do I have to factor something?
thanks!

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exam Other Question

the sum of the digits of a three digit number is 11. if the first and last digits are interchanged, the new number is greater than the original number by 594. if the tens and the u Can someone help me on this problem?

I need to divide:

10s^3 t^5 * 3s^3 t^5/3s^3 t^3

Thanks,
Lyn