5c^2-12=11c

Solution for 5c^2-12=11c equation:

5c^2-12=11c

We move all terms to the left:

5c^2-12-(11c)=0

a = 5; b = -11; c = -12;
Δ = b2-4ac
Δ = -112-4·5·(-12)
Δ = 361
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{361}=19$
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-11)-19}{2*5}=\frac{-8}{10}
=-4/5
$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+19}{2*5}=\frac{30}{10}
=3
$