2x*(x-2)=7x^2-7x

Solution for 2x*(x-2)=7x^2-7x equation:

2x(x-2)=7x^2-7x

We move all terms to the left:

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

We multiply parentheses

2x^2-4x-(7x^2-7x)=0

We get rid of parentheses

2x^2-7x^2-4x+7x=0

We add all the numbers together, and all the variables

-5x^2+3x=0

a = -5; b = 3; c = 0;
Δ = b2-4ac
Δ = 32-4·(-5)·0
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3}{2*-5}=\frac{-6}{-10}
=3/5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3}{2*-5}=\frac{0}{-10}
=0
$