(5x+5)*2x=180

Solution for (5x+5)*2x=180 equation:

(5x+5)*2x=180

We move all terms to the left:

(5x+5)*2x-(180)=0

We multiply parentheses

10x^2+10x-180=0

a = 10; b = 10; c = -180;
Δ = b2-4ac
Δ = 102-4·10·(-180)
Δ = 7300
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:

$\sqrt{\Delta}=\sqrt{7300}=\sqrt{100*73}=\sqrt{100}*\sqrt{73}=10\sqrt{73}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-10\sqrt{73}}{2*10}=\frac{-10-10\sqrt{73}}{20}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+10\sqrt{73}}{2*10}=\frac{-10+10\sqrt{73}}{20}
$