2x=1/3x+7

Solution for 2x=1/3x+7 equation:

2x=1/3x+7

We move all terms to the left:

2x-(1/3x+7)=0


Domain of the equation: 3x+7)!=0

x∈R


We get rid of parentheses

2x-1/3x-7=0

We multiply all the terms by the denominator


2x*3x-7*3x-1=0

Wy multiply elements

6x^2-21x-1=0

a = 6; b = -21; c = -1;
Δ = b2-4ac
Δ = -212-4·6·(-1)
Δ = 465
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{-(-21)-\sqrt{465}}{2*6}=\frac{21-\sqrt{465}}{12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{465}}{2*6}=\frac{21+\sqrt{465}}{12}
$