1/5x+9=1/2x

Solution for 1/5x+9=1/2x equation:

1/5x+9=1/2x

We move all terms to the left:

1/5x+9-(1/2x)=0


Domain of the equation: 5x!=0

x!=0/5

x!=0

x∈R



Domain of the equation: 2x)!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

1/5x-(+1/2x)+9=0

We get rid of parentheses

1/5x-1/2x+9=0

We calculate fractions


2x/10x^2+(-5x)/10x^2+9=0

We multiply all the terms by the denominator


2x+(-5x)+9*10x^2=0

Wy multiply elements

90x^2+2x+(-5x)=0

We get rid of parentheses

90x^2+2x-5x=0

We add all the numbers together, and all the variables

90x^2-3x=0

a = 90; b = -3; c = 0;
Δ = b2-4ac
Δ = -32-4·90·0
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*90}=\frac{0}{180}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+3}{2*90}=\frac{6}{180}
=1/30
$