exam Maths Puzzle Numerical Ability

simplify first and then solve the equation: {-7}+x=13

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two-thirds of the diameter of a cirlce that is 9/16 across and 9/16? V=R(1/x squared-1/y squared)solve for y
v=r((1/x^2)-(1/y)^2)
v/r=x^-2 - y^-2
(v/r)-(x^-2)=-y^-2
(x^-2)-(v/r)=y^-2
y=((x^-2)-(v/r))^(-1/2)