3x^2-12=7x

Solution for 3x^2-12=7x equation:

3x^2-12=7x

We move all terms to the left:

3x^2-12-(7x)=0

a = 3; b = -7; c = -12;
Δ = b2-4ac
Δ = -72-4·3·(-12)
Δ = 193
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-\sqrt{193}}{2*3}=\frac{7-\sqrt{193}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{193}}{2*3}=\frac{7+\sqrt{193}}{6}
$