2/3x+5-1/4x=-15

Solution for 2/3x+5-1/4x=-15 equation:

2/3x+5-1/4x=-15

We move all terms to the left:

2/3x+5-1/4x-(-15)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We add all the numbers together, and all the variables

2/3x-1/4x+20=0

We calculate fractions


8x/12x^2+(-3x)/12x^2+20=0

We multiply all the terms by the denominator


8x+(-3x)+20*12x^2=0

Wy multiply elements

240x^2+8x+(-3x)=0

We get rid of parentheses

240x^2+8x-3x=0

We add all the numbers together, and all the variables

240x^2+5x=0

a = 240; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·240·0
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-5}{2*240}=\frac{-10}{480}
=-1/48
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*240}=\frac{0}{480}
=0
$