1/3x+2/9x=30

Solution for 1/3x+2/9x=30 equation:

1/3x+2/9x=30

We move all terms to the left:

1/3x+2/9x-(30)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 9x!=0

x!=0/9

x!=0

x∈R


We calculate fractions


9x/27x^2+6x/27x^2-30=0

We multiply all the terms by the denominator


9x+6x-30*27x^2=0

We add all the numbers together, and all the variables

15x-30*27x^2=0

Wy multiply elements

-810x^2+15x=0

a = -810; b = 15; c = 0;
Δ = b2-4ac
Δ = 152-4·(-810)·0
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{-(15)-15}{2*-810}=\frac{-30}{-1620}
=1/54
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+15}{2*-810}=\frac{0}{-1620}
=0
$