7/8x-3/5x=3

Solution for 7/8x-3/5x=3 equation:

7/8x-3/5x=3

We move all terms to the left:

7/8x-3/5x-(3)=0


Domain of the equation: 8x!=0

x!=0/8

x!=0

x∈R



Domain of the equation: 5x!=0

x!=0/5

x!=0

x∈R


We calculate fractions


35x/40x^2+(-24x)/40x^2-3=0

We multiply all the terms by the denominator


35x+(-24x)-3*40x^2=0

Wy multiply elements

-120x^2+35x+(-24x)=0

We get rid of parentheses

-120x^2+35x-24x=0

We add all the numbers together, and all the variables

-120x^2+11x=0

a = -120; b = 11; c = 0;
Δ = b2-4ac
Δ = 112-4·(-120)·0
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{121}=11$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-11}{2*-120}=\frac{-22}{-240}
=11/120
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+11}{2*-120}=\frac{0}{-240}
=0
$