2/3x=9x-1

Solution for 2/3x=9x-1 equation:

2/3x=9x-1

We move all terms to the left:

2/3x-(9x-1)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We get rid of parentheses

2/3x-9x+1=0

We multiply all the terms by the denominator


-9x*3x+1*3x+2=0

Wy multiply elements

-27x^2+3x+2=0

a = -27; b = 3; c = +2;
Δ = b2-4ac
Δ = 32-4·(-27)·2
Δ = 225
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{225}=15$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-15}{2*-27}=\frac{-18}{-54}
=1/3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+15}{2*-27}=\frac{12}{-54}
=-2/9
$