3(x-2)x=+7

Solution for 3(x-2)x=+7 equation:

3(x-2)x=+7

We move all terms to the left:

3(x-2)x-(+7)=0

We add all the numbers together, and all the variables

3(x-2)x-7=0

We multiply parentheses

3x^2-6x-7=0

a = 3; b = -6; c = -7;
Δ = b2-4ac
Δ = -62-4·3·(-7)
Δ = 120
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{120}=\sqrt{4*30}=\sqrt{4}*\sqrt{30}=2\sqrt{30}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{30}}{2*3}=\frac{6-2\sqrt{30}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{30}}{2*3}=\frac{6+2\sqrt{30}}{6}
$