Question
$$16x^2+9x^2 = 4\cdot7$$
Answer
$$ \begin{matrix}x_1 = -2 \dfrac{\sqrt{ 7 }}{ 5 } & x_2 = \dfrac{ 2 \sqrt{ 7}}{ 5 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 16x^2+9x^2 &= 4\cdot7&& \text{simplify left and right hand side} \\[1 em]25x^2 &= 28&& \text{move all terms to the left hand side } \\[1 em]25x^2-28 &= 0&& \\[1 em] \end{aligned} $$
$ 25x^{2}-28 = 0 $ is a quadratic equation.
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