2(x+5)5x=35

Solution for 2(x+5)5x=35 equation:

2(x+5)5x=35

We move all terms to the left:

2(x+5)5x-(35)=0

We multiply parentheses

10x^2+50x-35=0

a = 10; b = 50; c = -35;
Δ = b2-4ac
Δ = 502-4·10·(-35)
Δ = 3900
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:

$\sqrt{\Delta}=\sqrt{3900}=\sqrt{100*39}=\sqrt{100}*\sqrt{39}=10\sqrt{39}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(50)-10\sqrt{39}}{2*10}=\frac{-50-10\sqrt{39}}{20}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(50)+10\sqrt{39}}{2*10}=\frac{-50+10\sqrt{39}}{20}
$