x-20/100*x=100

Solution for x-20/100*x=100 equation:

x-20/100x=100

We move all terms to the left:

x-20/100x-(100)=0


Domain of the equation: 100x!=0

x!=0/100

x!=0

x∈R


We multiply all the terms by the denominator


x*100x-100*100x-20=0

Wy multiply elements

100x^2-10000x-20=0

a = 100; b = -10000; c = -20;
Δ = b2-4ac
Δ = -100002-4·100·(-20)
Δ = 100008000
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:

$\sqrt{\Delta}=\sqrt{100008000}=\sqrt{14400*6945}=\sqrt{14400}*\sqrt{6945}=120\sqrt{6945}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10000)-120\sqrt{6945}}{2*100}=\frac{10000-120\sqrt{6945}}{200}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10000)+120\sqrt{6945}}{2*100}=\frac{10000+120\sqrt{6945}}{200}
$