$$ \begin{aligned} 6x^2 &= -15x+36&& \text{move all terms to the left hand side } \\[1 em]6x^2+15x-36 &= 0&& \\[1 em] \end{aligned} $$
$ 6x^{2}+15x-36 = 0 $ is a quadratic equation.
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