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

find the perimter of the triangle :
4 is one side and another side is 5square-3 square and the last side is 5 square+ 3square.

Thanks you How do I evaluate each function for the value of:

f(x)=x^2-7x+10; find (a) f(0), (b) f(5), and (c) f(-2)
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