Without an equality sign and not knowing the plus or minus values the given information can't be considered to be an equation.
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There is one and only one real solution, and no imaginary solutions, of the equation x13 = 1. The solution is x = 1. If x = -1 then x13 = -1, so that does not work. If x = i, then x13 = -i, so that does not work. If x = -i, then x13 = -i, so that does not work.
The product of 18 and 13 is 234
19'x13'
130 square feet !
299 square feet = 33.22 square yards