5x-3=(18-3)/x

Solution for 5x-3=(18-3)/x equation:

5x-3=(18-3)/x

We move all terms to the left:

5x-3-((18-3)/x)=0


Domain of the equation: x)!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

5x-(15/x)-3=0

We get rid of parentheses

5x-15/x-3=0

We multiply all the terms by the denominator


5x*x-3*x-15=0

We add all the numbers together, and all the variables

-3x+5x*x-15=0

Wy multiply elements

5x^2-3x-15=0

a = 5; b = -3; c = -15;
Δ = b2-4ac
Δ = -32-4·5·(-15)
Δ = 309
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-\sqrt{309}}{2*5}=\frac{3-\sqrt{309}}{10}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{309}}{2*5}=\frac{3+\sqrt{309}}{10}
$