1/3x-5/6x=4

Solution for 1/3x-5/6x=4 equation:

1/3x-5/6x=4

We move all terms to the left:

1/3x-5/6x-(4)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 6x!=0

x!=0/6

x!=0

x∈R


We calculate fractions


6x/18x^2+(-15x)/18x^2-4=0

We multiply all the terms by the denominator


6x+(-15x)-4*18x^2=0

Wy multiply elements

-72x^2+6x+(-15x)=0

We get rid of parentheses

-72x^2+6x-15x=0

We add all the numbers together, and all the variables

-72x^2-9x=0

a = -72; b = -9; c = 0;
Δ = b2-4ac
Δ = -92-4·(-72)·0
Δ = 81
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{81}=9$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-9}{2*-72}=\frac{0}{-144}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+9}{2*-72}=\frac{18}{-144}
=-1/8
$