x+31/2x+20=47

Solution for x+31/2x+20=47 equation:

x+31/2x+20=47

We move all terms to the left:

x+31/2x+20-(47)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R


We add all the numbers together, and all the variables

x+31/2x-27=0

We multiply all the terms by the denominator


x*2x-27*2x+31=0

Wy multiply elements

2x^2-54x+31=0

a = 2; b = -54; c = +31;
Δ = b2-4ac
Δ = -542-4·2·31
Δ = 2668
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:

$\sqrt{\Delta}=\sqrt{2668}=\sqrt{4*667}=\sqrt{4}*\sqrt{667}=2\sqrt{667}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-54)-2\sqrt{667}}{2*2}=\frac{54-2\sqrt{667}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-54)+2\sqrt{667}}{2*2}=\frac{54+2\sqrt{667}}{4}
$