2/3x-8=2/5x-4

Solution for 2/3x-8=2/5x-4 equation:

2/3x-8=2/5x-4

We move all terms to the left:

2/3x-8-(2/5x-4)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 5x-4)!=0

x∈R


We get rid of parentheses

2/3x-2/5x+4-8=0

We calculate fractions


10x/15x^2+(-6x)/15x^2+4-8=0

We add all the numbers together, and all the variables

10x/15x^2+(-6x)/15x^2-4=0

We multiply all the terms by the denominator


10x+(-6x)-4*15x^2=0

Wy multiply elements

-60x^2+10x+(-6x)=0

We get rid of parentheses

-60x^2+10x-6x=0

We add all the numbers together, and all the variables

-60x^2+4x=0

a = -60; b = 4; c = 0;
Δ = b2-4ac
Δ = 42-4·(-60)·0
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4}{2*-60}=\frac{-8}{-120}
=1/15
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4}{2*-60}=\frac{0}{-120}
=0
$