Question
$$16x\cdot3+60x^2+56x+15 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 13 }{ 15 }-\dfrac{\sqrt{ 451 }}{ 30 } & x_2 = -\dfrac{ 13 }{ 15 }+\dfrac{\sqrt{ 451 }}{ 30 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 16x\cdot3+60x^2+56x+15 &= 0&& \text{simplify left side} \\[1 em]48x+60x^2+56x+15 &= 0&& \\[1 em]60x^2+104x+15 &= 0&& \\[1 em] \end{aligned} $$
$ 60x^{2}+104x+15 = 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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