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Without an equality sign the given terms can't be considered to be an equation but if you mean 3d = -81 then the value of d works out as -27 by eliminating the 3 and dividing it into -81
x is an unknown number/fraction which needs to be solved.
If this is the equation of a circle, the answer is 11, except that there needs to be a plus sigb between the x2 and the y2