Algebra

Combining all like terms and moving all terms to one side we get

$6x^2-21x-31=0$

Now, we simply use the quadratic equation, we get

$x_{1,\:2}=\frac{-\left(-21\right)\pm \sqrt{\left(-21\right)^2-4\cdot \:6\left(-31\right)}}{2\cdot \:6}$

$x_1=\frac{-\left(-21\right)+\sqrt{1185}}{2\cdot \:6},\:x_2=\frac{-\left(-21\right)-\sqrt{1185}}{2\cdot \:6}$

$x=\frac{21+\sqrt{1185}}{12},\:x=\frac{21-\sqrt{1185}}{12}$

So our final answers are $x=\frac{21+\sqrt{1185}}{12},\:x=\frac{21-\sqrt{1185}}{12}$

Thanks! :)