exam Maths Puzzle Numerical Ability

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The sides of a rectangle have lengths x+9 and widths x-3.Which equation describes the perimeter,P,of the rectangle in terms of x?
a.P=x^2 +6x-27
b.P=4x+12
c.P=x^2+12x-27
d.P=2x+6 3x-(7x-5)=15