book Maths Puzzle Numerical Ability

15-(2x-7)=14

what is x = to???

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book Other Question

Find the distance from the point (9,5) to the line 4x - 3y = -4 I get this far and then stuck and not sure if its right.

Simply and write answer in positive exponents only

(x^2)^-3 (x^-2) divided by (x^2)^4

My answer
x^-1 times x^-