2/3x+5/6x=72

Solution for 2/3x+5/6x=72 equation:

2/3x+5/6x=72

We move all terms to the left:

2/3x+5/6x-(72)=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


12x/18x^2+15x/18x^2-72=0

We multiply all the terms by the denominator


12x+15x-72*18x^2=0

We add all the numbers together, and all the variables

27x-72*18x^2=0

Wy multiply elements

-1296x^2+27x=0

a = -1296; b = 27; c = 0;
Δ = b2-4ac
Δ = 272-4·(-1296)·0
Δ = 729
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{729}=27$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(27)-27}{2*-1296}=\frac{-54}{-2592}
=1/48
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(27)+27}{2*-1296}=\frac{0}{-2592}
=0
$