1/3x=2x+15

Solution for 1/3x=2x+15 equation:

1/3x=2x+15

We move all terms to the left:

1/3x-(2x+15)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We get rid of parentheses

1/3x-2x-15=0

We multiply all the terms by the denominator


-2x*3x-15*3x+1=0

Wy multiply elements

-6x^2-45x+1=0

a = -6; b = -45; c = +1;
Δ = b2-4ac
Δ = -452-4·(-6)·1
Δ = 2049
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{-(-45)-\sqrt{2049}}{2*-6}=\frac{45-\sqrt{2049}}{-12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-45)+\sqrt{2049}}{2*-6}=\frac{45+\sqrt{2049}}{-12}
$