In algebra, what is the solution of the exponential equation $3^{x + 2} = 81$ ?

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In algebra, what are the solutions of the quadratic equation $x^{2} - 9 x + 14 = 0$ ?
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In algebra, what is the solution set of the linear inequality $5 - 3 x < 14$ ?
In algebra, what is the 8th term of an arithmetic progression with first term $a_{1} = 4$ and common difference $d = 3$ ?
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In algebra, what is the natural domain of the function $f (x) = 3 x - 12$ ?