Find all values of $x$ such that $x^2 - 5x + 4 = -x^2 - 25x - 14$. If you find more than one value, then list your solutions, separated by commas.
First, let's move all terms to one side and combine all like terms. We get the equation
\(x^{2}+10x+9=0\)
Now, notice that we can easily factor the quadratic equation. We get
\((x+9)(x+1)=0\)
This gives us the values for x of
\(x=-1\\ x=-9\)
Thus, our answer is -1, -9.
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