Question
$$2x^2+4x-(2x-5+x^2)+x^2+7 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 1 }{ 2 }+\dfrac{\sqrt{ 23 }}{ 2 }i & x_2 = -\dfrac{ 1 }{ 2 }-\dfrac{\sqrt{ 23 }}{ 2 }i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x^2+4x-(2x-5+x^2)+x^2+7 &= 0&& \text{simplify left side} \\[1 em]2x^2+4x-2x+5-x^2+x^2+7 &= 0&& \\[1 em]2x^2+4x-2x+5-x^2+x^2+7 &= 0&& \\[1 em]2x^2+2x+12 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+2x+12 = 0 $ is a quadratic equation.
You can use step-by-step quadratic equation solver to see a detailed explanation on how to solve this equation.
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