12=5x^2-6x+4

Solution for 12=5x^2-6x+4 equation:

12=5x^2-6x+4

We move all terms to the left:

12-(5x^2-6x+4)=0

We get rid of parentheses

-5x^2+6x-4+12=0

We add all the numbers together, and all the variables

-5x^2+6x+8=0

a = -5; b = 6; c = +8;
Δ = b2-4ac
Δ = 62-4·(-5)·8
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{196}=14$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-14}{2*-5}=\frac{-20}{-10}
=+2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+14}{2*-5}=\frac{8}{-10}
=-4/5
$