book Maths Puzzle Numerical Ability

How do you solve this equation? -2(x-4)=15

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book Other Question

I have a right triangle I have to find the area for

On the figure they have points a b c
A to C 6ft C to B is 9ft and I must need A-B
the right triangle does show a 90 degree at point C What is the least common multiple of p and s if the greatest common factor of p and s is 9?